diff --git a/icu4c/source/common/propname.cpp b/icu4c/source/common/propname.cpp
new file mode 100644
index 00000000000..05c905a23a6
--- /dev/null
+++ b/icu4c/source/common/propname.cpp
@@ -0,0 +1,180 @@
+/*
+**********************************************************************
+* Copyright (c) 2002, International Business Machines
+* Corporation and others.  All Rights Reserved.
+**********************************************************************
+* Author: Alan Liu
+* Created: October 30 2002
+* Since: ICU 2.2
+**********************************************************************
+*/
+#include "propname.h"
+#include "unicode/uchar.h"
+#include "unicode/udata.h"
+#include "umutex.h"
+
+//----------------------------------------------------------------------
+// PropertyAliases implementation
+
+const char*
+PropertyAliases::chooseNameInGroup(Offset offset,
+                                   UPropertyNameChoice choice) const {
+    int32_t c = choice;
+    if (!offset || c < 0) {
+        return NULL;
+    }
+    const Offset* p = (const Offset*) getPointer(offset);
+    while (c-- > 0) {
+        if (*p++ < 0) return NULL;
+    }
+    Offset a = *p;
+    if (a < 0) a = -a;
+    return (const char*) getPointerNull(a);
+}
+
+const ValueMap*
+PropertyAliases::getValueMap(EnumValue prop) const {
+    NonContiguousEnumToOffset* e2o = (NonContiguousEnumToOffset*) getPointer(enumToValue_offset);
+    Offset a = e2o->getOffset(prop);
+    return (const ValueMap*) (a ? getPointerNull(a) : NULL);
+}
+
+inline const char*
+PropertyAliases::getPropertyName(EnumValue prop,
+                                 UPropertyNameChoice choice) const {
+    NonContiguousEnumToOffset* e2n = (NonContiguousEnumToOffset*) getPointer(enumToName_offset);
+    //    (prop < UCHAR_BINARY_LIMIT) ? enumToName_binaryOffset :
+    //                                  enumToName_enumeratedOffset);
+    return chooseNameInGroup(e2n->getOffset(prop), choice);
+}
+
+inline EnumValue
+PropertyAliases::getPropertyEnum(const char* alias) const {
+    NameToEnum* n2e = (NameToEnum*) getPointer(nameToEnum_offset);
+    return n2e->getEnum(alias, *this);
+}
+
+inline const char*
+PropertyAliases::getPropertyValueName(EnumValue prop,
+                                      EnumValue value,
+                                      UPropertyNameChoice choice) const {
+    const ValueMap* vm = getValueMap(prop);
+    if (!vm) return NULL;
+    Offset a;
+    if (vm->enumToName_offset) {
+        a = ((EnumToOffset*) getPointer(vm->enumToName_offset))->
+            getOffset(value);
+    } else {
+        a = ((NonContiguousEnumToOffset*) getPointer(vm->ncEnumToName_offset))->
+            getOffset(value);
+    }
+    return chooseNameInGroup(a, choice);
+}
+
+inline EnumValue
+PropertyAliases::getPropertyValueEnum(EnumValue prop,
+                                      const char* alias) const {
+    const ValueMap* vm = getValueMap(prop);
+    if (!vm) return UCHAR_INVALID_CODE;
+    NameToEnum* n2e = (NameToEnum*) getPointer(vm->nameToEnum_offset);
+    return n2e->getEnum(alias, *this);
+}
+
+//----------------------------------------------------------------------
+// UDataMemory structures
+
+static const PropertyAliases* PNAME = NULL;
+static UDataMemory* UDATA = NULL;
+
+//----------------------------------------------------------------------
+// UDataMemory loading/unloading
+
+/**
+ * udata callback to verify the zone data.
+ */
+U_CDECL_BEGIN
+static UBool U_CALLCONV
+isAcceptable(void* /*context*/,
+             const char* /*type*/, const char* /*name*/,
+             const UDataInfo* info) {
+    return
+        info->size >= sizeof(UDataInfo) &&
+        info->isBigEndian == U_IS_BIG_ENDIAN &&
+        info->charsetFamily == U_CHARSET_FAMILY &&
+        info->dataFormat[0] == PNAME_SIG_0 &&
+        info->dataFormat[1] == PNAME_SIG_1 &&
+        info->dataFormat[2] == PNAME_SIG_2 &&
+        info->dataFormat[3] == PNAME_SIG_3 &&
+        info->formatVersion[0] == PNAME_FORMAT_VERSION;
+}
+
+UBool
+pname_cleanup() {
+    if (UDATA) {
+        udata_close(UDATA);
+        UDATA = NULL;
+    }
+    PNAME = NULL;
+    return TRUE;
+}
+U_CDECL_END
+
+static UBool load() {
+    if (!PNAME) {
+        UErrorCode ec = U_ZERO_ERROR;
+        UDataMemory* data =
+            udata_openChoice(0, PNAME_DATA_TYPE, PNAME_DATA_NAME,
+                             isAcceptable, 0, &ec);
+        if (U_SUCCESS(ec)) {
+            umtx_lock(NULL);
+            if (UDATA == NULL) {
+                UDATA = data;
+                PNAME = (const PropertyAliases*) udata_getMemory(UDATA);
+                data = NULL;
+            }
+            umtx_unlock(NULL);
+        }
+        if (data) {
+            udata_close(data);
+        }
+    }
+    return PNAME!=NULL;
+}
+
+//----------------------------------------------------------------------
+// Public API implementation
+
+// The C API is just a thin wrapper.  Each function obtains a pointer
+// to the singleton PropertyAliases, and calls the appropriate method
+// on it.  If it cannot obtain a pointer, because valid data is not
+// available, then it returns NULL or UCHAR_INVALID_CODE.
+
+U_CAPI const char* U_EXPORT2
+u_getPropertyName(UProperty property,
+                  UPropertyNameChoice nameChoice) {
+    return load() ? PNAME->getPropertyName(property, nameChoice)
+                  : NULL;
+}
+
+U_CAPI UProperty U_EXPORT2
+u_getPropertyEnum(const char* alias) {
+    return load() ? (UProperty) PNAME->getPropertyEnum(alias)
+                  : UCHAR_INVALID_CODE;
+}
+
+U_CAPI const char* U_EXPORT2
+u_getPropertyValueName(UProperty property,
+                       int32_t value,
+                       UPropertyNameChoice nameChoice) {
+    return load() ? PNAME->getPropertyValueName(property, value, nameChoice)
+                  : NULL;
+}
+
+U_CAPI int32_t U_EXPORT2
+u_getPropertyValueEnum(UProperty property,
+                       const char* alias) {
+    return load() ? PNAME->getPropertyValueEnum(property, alias)
+                  : UCHAR_INVALID_CODE;
+}
+
+//eof
diff --git a/icu4c/source/common/propname.h b/icu4c/source/common/propname.h
new file mode 100644
index 00000000000..6a43a1a7114
--- /dev/null
+++ b/icu4c/source/common/propname.h
@@ -0,0 +1,377 @@
+/*
+**********************************************************************
+* Copyright (c) 2002, International Business Machines
+* Corporation and others.  All Rights Reserved.
+**********************************************************************
+* Author: Alan Liu
+* Created: October 30 2002
+* Since: ICU 2.2
+**********************************************************************
+*/
+#ifndef PROPNAME_H
+#define PROPNAME_H
+
+#include "unicode/utypes.h"
+#include "unicode/uchar.h"
+#include "uprops.h"
+
+// This header defines the in-memory layout of the property names data
+// structure representing the UCD data files PropertyAliases.txt and
+// PropertyValueAliases.txt.  It is used by:
+//   propname.cpp - reads data
+//   genpname     - creates data
+
+//----------------------------------------------------------------------
+// UDataMemory structure and signatures
+
+#define PNAME_DATA_NAME "pnames"
+#define PNAME_DATA_TYPE "icu"
+
+// Fields in UDataInfo:
+
+// PNAME_SIG[] is encoded as numeric literals for compatibility with the HP compiler
+static const uint8_t PNAME_SIG_0 = 0x70; // p
+static const uint8_t PNAME_SIG_1 = 0x6E; // n
+static const uint8_t PNAME_SIG_2 = 0x61; // a
+static const uint8_t PNAME_SIG_3 = 0x6D; // m
+
+static const int8_t PNAME_FORMAT_VERSION = 1; // formatVersion[0]
+
+//----------------------------------------------------------------------
+// PropertyAliases class
+
+/**
+ * An offset from the start of the pnames data to a contained entity.
+ * This must be a signed value, since negative offsets are used as an
+ * end-of-list marker.  Offsets to actual objects are non-zero.  A
+ * zero offset indicates an absent entry; this corresponds to aliases
+ * marked "n/a" in the original Unicode data files.
+ */
+typedef int16_t Offset; // must be signed
+
+#define MAX_OFFSET 0x7FFF
+
+/**
+ * A generic value for a property or property value.  Typically an
+ * enum from uchar.h, but sometimes a non-enum value.  It must be
+ * large enough to accomodate the largest enum value, which as of this
+ * writing is the largest general category mask.  Need not be signed
+ * but may be.  Typically it doesn't matter, since the caller will
+ * cast it to the proper type before use.  Takes the special value
+ * UCHAR_INVALID_CODE for invalid input.
+ */
+typedef int32_t EnumValue;
+
+struct ValueMap; // fwd decl
+
+/**
+ * A class encapsulating access to the memory-mapped data representing
+ * property aliases and property value aliases (pnames).  The class
+ * MUST have no v-table and declares certain methods inline -- small
+ * methods and methods that are called from only one point.
+ *
+ * The data members in this class correspond to the in-memory layout
+ * of the header of the pnames data.
+ */
+class PropertyAliases {
+
+    // -- begin pnames data --
+    // Enum=>name EnumToOffset object for binary and enumerated
+    // properties
+    //DELETED:Offset enumToName_binaryOffset;
+    //DELETED:Offset enumToName_enumeratedOffset;
+    Offset enumToName_offset;
+
+    // Name=>enum data for binary & enumerated properties
+    Offset nameToEnum_offset;
+
+    // Enum=>offset EnumToOffset object mapping enumerated properties
+    // to ValueMap objects
+    Offset enumToValue_offset;
+    // -- end pnames data --
+
+    friend class Builder;
+
+    const ValueMap* getValueMap(EnumValue prop) const;
+
+    const char* chooseNameInGroup(Offset offset,
+                                  UPropertyNameChoice choice) const;
+
+ public:
+
+    inline const int8_t* getPointer(Offset o) const {
+        return ((const int8_t*) this) + o;
+    }
+
+    inline const int8_t* getPointerNull(Offset o) const {
+        return o ? getPointer(o) : NULL;
+    }
+
+    inline const char* getPropertyName(EnumValue prop,
+                                       UPropertyNameChoice choice) const;
+    
+    inline EnumValue getPropertyEnum(const char* alias) const;
+
+    inline const char* getPropertyValueName(EnumValue prop, EnumValue value,
+                                            UPropertyNameChoice choice) const;
+    
+    inline EnumValue getPropertyValueEnum(EnumValue prop,
+                                          const char* alias) const;
+};
+
+//----------------------------------------------------------------------
+// ValueMap
+
+/**
+ * For any top-level property that has named values (binary and
+ * enumerated properties), there is a ValueMap object.  This object
+ * maps from enum values to two other maps.  One goes from value enums
+ * to value names.  The other goes from value names to value enums.
+ * 
+ * The value enum values may be contiguous or disjoint.  If they are
+ * contiguous then the enumToName_offset is nonzero, and the
+ * ncEnumToName_offset is zero.  Vice versa if the value enums are
+ * disjoint.
+ *
+ * There are n of these objects, where n is the number of binary
+ * properties + the number of enumerated properties.
+ */
+struct ValueMap {
+
+    // -- begin pnames data --
+    // Enum=>name EnumToOffset / NonContiguousEnumToOffset objects.
+    // Exactly one of these will be nonzero.
+    Offset enumToName_offset;
+    Offset ncEnumToName_offset;
+
+    Offset nameToEnum_offset; // Name=>enum data
+    // -- end pnames data --
+};
+
+//----------------------------------------------------------------------
+// EnumToOffset
+
+/**
+ * A generic map from enum values to Offsets.  The enum values must be
+ * contiguous, from enumStart to enumLimit.  The Offset values may
+ * point to anything.
+ */
+class EnumToOffset {
+
+    // -- begin pnames data --
+    EnumValue enumStart;
+    EnumValue enumLimit;
+    Offset _offsetArray; // [array of enumLimit-enumStart]
+    // -- end pnames data --
+
+    friend class Builder;
+
+    Offset* getOffsetArray() {
+        return &_offsetArray;
+    }
+
+    const Offset* getOffsetArray() const {
+        return &_offsetArray;
+    }
+
+    static int32_t getSize(int32_t n) {
+        return sizeof(EnumToOffset) + sizeof(Offset) * (n - 1);
+    }
+
+ public:
+
+    Offset getOffset(EnumValue enumProbe) const {
+        if (enumProbe < enumStart ||
+            enumProbe >= enumLimit) {
+            return 0; // not found
+        }
+        const Offset* p = getOffsetArray();
+        return p[enumProbe - enumStart];
+    }
+};
+
+//----------------------------------------------------------------------
+// NonContiguousEnumToOffset
+
+/**
+ * A generic map from enum values to Offsets.  The enum values may be
+ * disjoint.  If they are contiguous, an EnumToOffset should be used
+ * instead.  The Offset values may point to anything.
+ */
+class NonContiguousEnumToOffset {
+
+    // -- begin pnames data --
+    int32_t count;
+    EnumValue _enumArray; // [array of count]
+    // Offset _offsetArray; // [array of count] after enumValue[count-1]
+    // -- end pnames data --
+
+    friend class Builder;
+
+    EnumValue* getEnumArray() {
+        return &_enumArray;
+    }
+
+    const EnumValue* getEnumArray() const {
+        return &_enumArray;
+    }
+    
+    Offset* getOffsetArray() {
+        return (Offset*) (getEnumArray() + count);
+    }
+
+    const Offset* getOffsetArray() const {
+        return (Offset*) (getEnumArray() + count);
+    }
+
+    static int32_t getSize(int32_t n) {
+        return sizeof(int32_t) + (sizeof(EnumValue) + sizeof(Offset)) * n;
+    }
+
+ public:
+
+    Offset getOffset(EnumValue enumProbe) const {
+        const EnumValue* e = getEnumArray();
+        const Offset* p = getOffsetArray();
+        // linear search; binary later if warranted
+        // (binary is not faster for short lists)
+        for (int32_t i=0; i<count; ++i) {
+            if (e[i] < enumProbe) continue;
+            if (e[i] > enumProbe) break;
+            return p[i];
+        }
+        return 0; // not found
+    }
+};
+
+//----------------------------------------------------------------------
+// NameToEnum
+
+/**
+ * A map from names to enum values.
+ */
+class NameToEnum {
+
+    // -- begin pnames data --
+    int32_t count;       // number of entries
+    EnumValue _enumArray; // [array of count] EnumValues
+    // Offset _nameArray; // [array of count] offsets to names
+    // -- end pnames data --
+
+    friend class Builder;
+
+    EnumValue* getEnumArray() {
+        return &_enumArray;
+    }
+
+    const EnumValue* getEnumArray() const {
+        return &_enumArray;
+    }
+
+    Offset* getNameArray() {
+        return (Offset*) (getEnumArray() + count);
+    }
+
+    const Offset* getNameArray() const {
+        return (Offset*) (getEnumArray() + count);
+    }
+
+    static int32_t getSize(int32_t n) {
+        return sizeof(int32_t) + (sizeof(Offset) + sizeof(EnumValue)) * n;
+    }
+
+ public:
+  
+    EnumValue getEnum(const char* alias, const PropertyAliases& data) const {
+
+        const Offset* n = getNameArray();
+        const EnumValue* e = getEnumArray();
+
+        // linear search; binary later if warranted
+        // (binary is not faster for short lists)
+        for (int32_t i=0; i<count; ++i) {
+            const char* name = (const char*) data.getPointer(n[i]);
+            int32_t c = uprv_comparePropertyNames(alias, name);
+            if (c > 0) continue;
+            if (c < 0) break;
+            return e[i];
+        }
+        
+        return UCHAR_INVALID_CODE;
+    }
+};
+
+/*----------------------------------------------------------------------
+ * 
+ * In-memory layout
+ * (>x) this structure refers to structure x
+ * 
+ * header:
+ *  enumToName_offset (>0)
+ *  nameToEnum_offset (>2)
+ *  enumToValue_offset (>3)
+ * 
+ * 0: # EnumToOffset obj for props => name groups
+ *  count
+ *  enumArray [x count]
+ *  offsetArray [x count] (>98)
+ * 
+ * => pad to next 4-byte boundary
+ * 
+ * (1: omitted -- no longer used)
+ * 
+ * 2: # NameToEnum obj for binary & enumerated props
+ *  count
+ *  enumArray [x count]
+ *  nameArray [x count] (>99)
+ * 
+ * => pad to next 4-byte boundary
+ * 
+ * 3: # EnumToOffset obj for enumerated props => ValueMaps
+ *  count
+ *  enumArray [x count]
+ *  offsetArray [x count] (>4)
+ * 
+ * => pad to next 4-byte boundary
+ * 
+ * 4: # ValueMap array [x one for each enumerated prop i]
+ *  enumToName_offset (>5a +2*i)   one of these two is NULL, one is not
+ *  ncEnumToName_offset (>5b +2*i)
+ *  nameToEnums_offset (>6 +2*i)
+ * 
+ * => pad to next 4-byte boundary
+ * 
+ * for each enumerated prop (either 5a or 5b):
+ * 
+ *   5a: # EnumToOffset for enumerated prop's values => name groups
+ *    enumStart
+ *    enumLimit
+ *    offsetArray [x enumLimit - enumStart] (>98) 
+ * 
+ *   => pad to next 4-byte boundary
+ * 
+ *   5b: # NonContiguousEnumToOffset for enumerated prop's values => name groups
+ *    count
+ *    enumArray [x count]
+ *    offsetArray [x count] (>98)
+ * 
+ *   => pad to next 4-byte boundary
+ * 
+ *   6: # NameToEnum for enumerated prop's values
+ *    count
+ *    enumArray [x count]
+ *    nameArray [x count] (>99)
+ * 
+ *   => pad to next 4-byte boundary
+ * 
+ * 98: # name group pool {NGP}
+ *  [array of Offset values] (>99)
+ * 
+ * 99: # string pool {SP}
+ *  [pool of nul-terminated char* strings]
+ * 
+ */
+
+#endif
+
+//eof