diff --git a/icu4c/source/common/unicode/ubrk.h b/icu4c/source/common/unicode/ubrk.h
index afb9c4ce9d0..f4e734aa5c4 100644
--- a/icu4c/source/common/unicode/ubrk.h
+++ b/icu4c/source/common/unicode/ubrk.h
@@ -185,7 +185,7 @@
  */
 
 /** The possible types of text boundaries.  @stable ICU 2.0 */
-typedef enum  {
+typedef enum UBreakIteratorType {
   /** Character breaks  @stable ICU 2.0 */
   UBRK_CHARACTER,
   /** Word breaks @stable ICU 2.0 */
@@ -223,7 +223,7 @@ typedef enum  {
  *  than for single individual values.
  *  @stable ICU 2.2
 */
-typedef enum  {
+typedef enum UWordBreak {
     /** Tag value for "words" that do not fit into any of other categories. 
      *  Includes spaces and most punctuation. */
     UBRK_WORD_NONE           = 0,
@@ -256,7 +256,7 @@ typedef enum  {
  *  than for single individual values.
  *  @stable ICU 2.8
 */
-typedef enum  {
+typedef enum ULineBreakTag {
     /** Tag value for soft line breaks, positions at which a line break
       *  is acceptable but not required                */
     UBRK_LINE_SOFT            = 0,
@@ -278,7 +278,7 @@ typedef enum  {
  *  than for single individual values.
  *  @stable ICU 2.8
 */
-typedef enum  {
+typedef enum USentenceBreakTag {
     /** Tag value for for sentences  ending with a sentence terminator
       * ('.', '?', '!', etc.) character, possibly followed by a
       * hard separator (CR, LF, PS, etc.)
diff --git a/icu4c/source/common/unicode/uchar.h b/icu4c/source/common/unicode/uchar.h
index 86b46c7c89b..0adb47f83c5 100644
--- a/icu4c/source/common/unicode/uchar.h
+++ b/icu4c/source/common/unicode/uchar.h
@@ -171,7 +171,7 @@ U_CDECL_BEGIN
  * @see u_getUnicodeVersion
  * @stable ICU 2.1
  */
-typedef enum  {
+typedef enum UProperty {
     /*  See note !!.  Comments of the form "Binary property Dash",
         "Enumerated property Script", "Double property Numeric_Value",
         and "String property Age" are read by genpname. */
@@ -575,7 +575,8 @@ typedef enum  {
  * See http://www.unicode.org/Public/UNIDATA/UnicodeData.html .
  * @stable ICU 2.0
  */
-typedef enum {
+typedef enum UCharCategory
+{
     /** See note !!.  Comments of the form "Cn" are read by genpname. */
 
     /** Non-category for unassigned and non-character code points. @stable ICU 2.0 */
@@ -760,7 +761,7 @@ typedef enum {
  * This specifies the language directional property of a character set.
  * @stable ICU 2.0
  */
-typedef enum  {
+typedef enum UCharDirection {
     /** See note !!.  Comments of the form "EN" are read by genpname. */
 
     /** L @stable ICU 2.0 */
@@ -1249,7 +1250,7 @@ typedef enum UBlockCode UBlockCode;
  * @see u_getIntPropertyValue
  * @stable ICU 2.2
  */
-typedef enum  {
+typedef enum UEastAsianWidth {
     U_EA_NEUTRAL,   /*[N]*/ /*See note !!*/
     U_EA_AMBIGUOUS, /*[A]*/
     U_EA_HALFWIDTH, /*[H]*/
@@ -1274,7 +1275,7 @@ typedef enum  {
  * @see u_charName
  * @stable ICU 2.0
  */
-typedef enum  {
+typedef enum UCharNameChoice {
     U_UNICODE_CHAR_NAME,
     U_UNICODE_10_CHAR_NAME,
     U_EXTENDED_CHAR_NAME,
@@ -1294,7 +1295,7 @@ typedef enum  {
  * @see u_getPropertyValueName()
  * @stable ICU 2.4
  */
-typedef enum {
+typedef enum UPropertyNameChoice {
     U_SHORT_PROPERTY_NAME,
     U_LONG_PROPERTY_NAME,
     U_PROPERTY_NAME_CHOICE_COUNT
@@ -1306,7 +1307,7 @@ typedef enum {
  * @see UCHAR_DECOMPOSITION_TYPE
  * @stable ICU 2.2
  */
-typedef enum  {
+typedef enum UDecompositionType {
     U_DT_NONE,              /*[none]*/ /*See note !!*/
     U_DT_CANONICAL,         /*[can]*/
     U_DT_COMPAT,            /*[com]*/
@@ -1334,7 +1335,7 @@ typedef enum  {
  * @see UCHAR_JOINING_TYPE
  * @stable ICU 2.2
  */
-typedef enum  {
+typedef enum UJoiningType {
     U_JT_NON_JOINING,       /*[U]*/ /*See note !!*/
     U_JT_JOIN_CAUSING,      /*[C]*/
     U_JT_DUAL_JOINING,      /*[D]*/
@@ -1350,7 +1351,7 @@ typedef enum  {
  * @see UCHAR_JOINING_GROUP
  * @stable ICU 2.2
  */
-typedef enum  {
+typedef enum UJoiningGroup {
     U_JG_NO_JOINING_GROUP,
     U_JG_AIN,
     U_JG_ALAPH,
@@ -1414,7 +1415,7 @@ typedef enum  {
  * @see UCHAR_GRAPHEME_CLUSTER_BREAK
  * @draft ICU 3.4
  */
-typedef enum  {
+typedef enum UGraphemeClusterBreak {
     U_GCB_OTHER,            /*[XX]*/ /*See note !!*/
     U_GCB_CONTROL,          /*[CN]*/
     U_GCB_CR,               /*[CR]*/
@@ -1435,7 +1436,7 @@ typedef enum  {
  * @see UCHAR_WORD_BREAK
  * @draft ICU 3.4
  */
-typedef enum  {
+typedef enum UWordBreakValues {
     U_WB_OTHER,             /*[XX]*/ /*See note !!*/
     U_WB_ALETTER,           /*[LE]*/
     U_WB_FORMAT,            /*[FO]*/
@@ -1453,7 +1454,7 @@ typedef enum  {
  * @see UCHAR_SENTENCE_BREAK
  * @draft ICU 3.4
  */
-typedef enum  {
+typedef enum USentenceBreak {
     U_SB_OTHER,             /*[XX]*/ /*See note !!*/
     U_SB_ATERM,             /*[AT]*/
     U_SB_CLOSE,             /*[CL]*/
@@ -1474,7 +1475,7 @@ typedef enum  {
  * @see UCHAR_LINE_BREAK
  * @stable ICU 2.2
  */
-typedef enum  {
+typedef enum ULineBreak {
     U_LB_UNKNOWN,           /*[XX]*/ /*See note !!*/
     U_LB_AMBIGUOUS,         /*[AI]*/
     U_LB_ALPHABETIC,        /*[AL]*/
@@ -1522,7 +1523,7 @@ typedef enum  {
  * @see UCHAR_NUMERIC_TYPE
  * @stable ICU 2.2
  */
-typedef enum  {
+typedef enum UNumericType {
     U_NT_NONE,              /*[None]*/ /*See note !!*/
     U_NT_DECIMAL,           /*[de]*/
     U_NT_DIGIT,             /*[di]*/
@@ -1536,7 +1537,7 @@ typedef enum  {
  * @see UCHAR_HANGUL_SYLLABLE_TYPE
  * @stable ICU 2.6
  */
-typedef enum  {
+typedef enum UHangulSyllableType {
     U_HST_NOT_APPLICABLE,   /*[NA]*/ /*See note !!*/
     U_HST_LEADING_JAMO,     /*[L]*/
     U_HST_VOWEL_JAMO,       /*[V]*/
diff --git a/icu4c/source/common/unicode/ucnv.h b/icu4c/source/common/unicode/ucnv.h
index 599b7d0a4b2..14ac8021adb 100644
--- a/icu4c/source/common/unicode/ucnv.h
+++ b/icu4c/source/common/unicode/ucnv.h
@@ -810,7 +810,7 @@ ucnv_getStarters(const UConverter* converter,
  * @see ucnv_getUnicodeSet
  * @stable ICU 2.6
  */
-typedef enum  {
+typedef enum UConverterUnicodeSet {
     /** Select the set of roundtrippable Unicode code points. @stable ICU 2.6 */
     UCNV_ROUNDTRIP_SET,
     /** Number of UConverterUnicodeSet selectors. @stable ICU 2.6 */
diff --git a/icu4c/source/common/unicode/udata.h b/icu4c/source/common/unicode/udata.h
index 2097d8da554..0881ef32453 100644
--- a/icu4c/source/common/unicode/udata.h
+++ b/icu4c/source/common/unicode/udata.h
@@ -353,7 +353,7 @@ udata_setAppData(const char *packageName, const void *data, UErrorCode *err);
  * @see udata_setFileAccess
  * @draft ICU 3.4
  */
-typedef enum  {
+typedef enum UDataFileAccess {
     /** ICU does not access the file system for data loading. */
     UDATA_NO_FILES,
     /** ICU only loads data from packages, not from single files. */
diff --git a/icu4c/source/common/unicode/uiter.h b/icu4c/source/common/unicode/uiter.h
index 6062374cebd..42c76677ed7 100644
--- a/icu4c/source/common/unicode/uiter.h
+++ b/icu4c/source/common/unicode/uiter.h
@@ -46,7 +46,7 @@ typedef struct UCharIterator UCharIterator; /**< C typedef for struct UCharItera
  * @see UCharIterator
  * @stable ICU 2.1
  */
-typedef enum  {
+typedef enum UCharIteratorOrigin {
     UITER_START, UITER_CURRENT, UITER_LIMIT, UITER_ZERO, UITER_LENGTH
 } UCharIteratorOrigin;
 
diff --git a/icu4c/source/common/unicode/unorm.h b/icu4c/source/common/unicode/unorm.h
index 151a6ea69f9..31c52245116 100644
--- a/icu4c/source/common/unicode/unorm.h
+++ b/icu4c/source/common/unicode/unorm.h
@@ -207,7 +207,7 @@ unorm_normalize(const UChar *source, int32_t sourceLength,
  * For details see Unicode Technical Report 15.
  * @stable ICU 2.0
  */
-typedef enum  {
+typedef enum UNormalizationCheckResult {
   /** 
    * Indicates that string is not in the normalized format
    */
diff --git a/icu4c/source/common/unicode/uscript.h b/icu4c/source/common/unicode/uscript.h
index 1ab5b024653..3420299a023 100644
--- a/icu4c/source/common/unicode/uscript.h
+++ b/icu4c/source/common/unicode/uscript.h
@@ -26,7 +26,7 @@
  *
  * @stable ICU 2.2
  */
-typedef enum  {
+typedef enum UScriptCode {
       USCRIPT_INVALID_CODE = -1,
       USCRIPT_COMMON       =  0 , /* Zyyy */
       USCRIPT_INHERITED    =  1,  /* Qaai */
diff --git a/icu4c/source/common/unicode/utrace.h b/icu4c/source/common/unicode/utrace.h
index 98426f5754d..edf50b0c2f7 100644
--- a/icu4c/source/common/unicode/utrace.h
+++ b/icu4c/source/common/unicode/utrace.h
@@ -37,7 +37,7 @@ U_CDECL_BEGIN
  * @see utrace_setLevel
  * @stable ICU 2.8
  */
-typedef enum  {
+typedef enum UTraceLevel {
     /** Disable all tracing  @stable ICU 2.8*/
     UTRACE_OFF=-1,
     /** Trace error conditions only  @stable ICU 2.8*/
@@ -56,7 +56,7 @@ typedef enum  {
  *  These are the ICU functions that will be traced when tracing is enabled.
  *  @stable ICU 2.8
  */
-typedef enum  {
+typedef enum UTraceFunctionNumber {
     UTRACE_FUNCTION_START=0,
     UTRACE_U_INIT=UTRACE_FUNCTION_START,
     UTRACE_U_CLEANUP,
diff --git a/icu4c/source/common/unicode/utypes.h b/icu4c/source/common/unicode/utypes.h
index 2163aad5797..2672c74289c 100644
--- a/icu4c/source/common/unicode/utypes.h
+++ b/icu4c/source/common/unicode/utypes.h
@@ -546,7 +546,7 @@ operator delete[](void * /*p*/) {
  * Error codes should be tested using U_FAILURE() and U_SUCCESS().
  * @stable ICU 2.0
  */
-typedef enum {
+typedef enum UErrorCode {
     /* The ordering of U_ERROR_INFO_START Vs U_USING_FALLBACK_WARNING looks weird
      * and is that way because VC++ debugger displays first encountered constant,
      * which is not the what the code is used for
diff --git a/icu4c/source/i18n/unicode/ucurr.h b/icu4c/source/i18n/unicode/ucurr.h
index d7e150cca8d..ac0d81ea46f 100644
--- a/icu4c/source/i18n/unicode/ucurr.h
+++ b/icu4c/source/i18n/unicode/ucurr.h
@@ -61,7 +61,7 @@ ucurr_forLocale(const char* locale,
  * @see ucurr_getName
  * @stable ICU 2.6
  */
-typedef enum {
+typedef enum UCurrNameStyle {
     /**
      * Selector for ucurr_getName indicating a symbolic name for a
      * currency, such as "$" for USD.
@@ -170,7 +170,7 @@ ucurr_getRoundingIncrement(const UChar* currency,
  * @see ucurr_openCurrencies
  * @draft ICU 3.2
  */
-typedef enum {
+typedef enum UCurrCurrencyType {
     /**
      * Select all ISO-4217 currency codes.
      * @draft ICU 3.2
diff --git a/icu4c/source/i18n/unicode/udat.h b/icu4c/source/i18n/unicode/udat.h
index 14c30ee3f0f..ee1f0d50fed 100644
--- a/icu4c/source/i18n/unicode/udat.h
+++ b/icu4c/source/i18n/unicode/udat.h
@@ -139,7 +139,7 @@ typedef void* UDateFormat;
 /** The possible date/time format styles 
  *  @stable ICU 2.6
  */
-typedef enum {
+typedef enum UDateFormatStyle {
     /** Full style */
     UDAT_FULL,
     /** Long style */
@@ -162,7 +162,7 @@ typedef enum {
  * defined by DateFormat and UDateFormat.
  * @draft ICU 3.0
  */
-typedef enum {
+typedef enum UDateFormatField {
     /**
      * FieldPosition and UFieldPosition selector for 'G' field alignment,
      * corresponding to the UCAL_ERA field.
@@ -659,7 +659,7 @@ udat_applyPattern(            UDateFormat     *format,
  * The possible types of date format symbols 
  * @stable ICU 2.6
  */
-typedef enum {
+typedef enum UDateFormatSymbolType {
     /** The era names, for example AD */
     UDAT_ERAS,
     /** The month names, for example February */
diff --git a/icu4c/source/i18n/unicode/ulocdata.h b/icu4c/source/i18n/unicode/ulocdata.h
index 73a8fa7aa9f..84ba9ee13dd 100644
--- a/icu4c/source/i18n/unicode/ulocdata.h
+++ b/icu4c/source/i18n/unicode/ulocdata.h
@@ -45,20 +45,20 @@ typedef struct ULocaleData {
 /** The possible types of exemplar character sets.
   * @draft ICU 3.4
   */
-typedef enum  {
-     ULOCDATA_ES_STANDARD,      /** Basic set */
-     ULOCDATA_ES_AUXILIARY,     /** Auxiliary set */
-     ULOCDATA_ES_COUNT          
+typedef enum ULocaleDataExemplarSetType {
+     ULOCDATA_ES_STANDARD,      /* Basic set */
+     ULOCDATA_ES_AUXILIARY,     /* Auxiliary set */
+     ULOCDATA_ES_COUNT
 } ULocaleDataExemplarSetType;
 
 /** The possible types of delimiters.
   * @draft ICU 3.4
   */
-typedef enum {
-     ULOCDATA_QUOTATION_START,     /** Quotation start */
-     ULOCDATA_QUOTATION_END,       /** Quotation end */
-     ULOCDATA_ALT_QUOTATION_START, /** Alternate quotation start */
-     ULOCDATA_ALT_QUOTATION_END,   /** Alternate quotation end */
+typedef enum ULocaleDataDelimiterType {
+     ULOCDATA_QUOTATION_START,     /* Quotation start */
+     ULOCDATA_QUOTATION_END,       /* Quotation end */
+     ULOCDATA_ALT_QUOTATION_START, /* Alternate quotation start */
+     ULOCDATA_ALT_QUOTATION_END,   /* Alternate quotation end */
      ULOCDATA_DELIMITER_COUNT
 } ULocaleDataDelimiterType;
 
@@ -160,7 +160,7 @@ ulocdata_getDelimiter(ULocaleData *uld, ULocaleDataDelimiterType type, UChar *re
  * Enumeration for representing the measurement systems.
  * @draft ICU 2.8
  */
-typedef enum {
+typedef enum UMeasurementSystem {
     UMS_SI,     /** Measurement system specified by SI otherwise known as Metric system. */
     UMS_US,     /** Measurement system followed in the United States of America. */ 
     UMS_LIMIT
diff --git a/icu4c/source/i18n/unicode/unum.h b/icu4c/source/i18n/unicode/unum.h
index 9b46eb8d6b6..e699adb3d41 100644
--- a/icu4c/source/i18n/unicode/unum.h
+++ b/icu4c/source/i18n/unicode/unum.h
@@ -130,7 +130,7 @@ typedef void* UNumberFormat;
 /** The possible number format styles. 
  *  @stable ICU 2.0
  */
-typedef enum  {
+typedef enum UNumberFormatStyle {
     /**
      * Decimal format defined by pattern 
      * @draft ICU 3.0
@@ -170,7 +170,7 @@ typedef enum  {
 /** The possible number format rounding modes. 
  *  @stable ICU 2.0
  */
-typedef enum  {
+typedef enum UNumberFormatRoundingMode {
     UNUM_ROUND_CEILING,
     UNUM_ROUND_FLOOR,
     UNUM_ROUND_DOWN,
@@ -183,7 +183,7 @@ typedef enum  {
 /** The possible number format pad positions. 
  *  @stable ICU 2.0
  */
-typedef enum {
+typedef enum UNumberFormatPadPosition {
     UNUM_PAD_BEFORE_PREFIX,
     UNUM_PAD_AFTER_PREFIX,
     UNUM_PAD_BEFORE_SUFFIX,
@@ -518,7 +518,7 @@ U_CAPI int32_t U_EXPORT2
 unum_countAvailable(void);
 
 /** The possible UNumberFormat numeric attributes @stable ICU 2.0 */
-typedef enum {
+typedef enum UNumberFormatAttribute {
   /** Parse integers only */
   UNUM_PARSE_INT_ONLY,
   /** Use grouping separator */
@@ -649,7 +649,7 @@ unum_setDoubleAttribute(    UNumberFormat*          fmt,
             double                 newValue);
 
 /** The possible UNumberFormat text attributes @stable ICU 2.0*/
-typedef enum {
+typedef enum UNumberFormatTextAttribute {
   /** Positive prefix */
   UNUM_POSITIVE_PREFIX,
   /** Positive suffix */
@@ -754,7 +754,7 @@ unum_toPattern(    const    UNumberFormat*          fmt,
  * Constants for specifying a number format symbol.
  * @stable ICU 2.0
  */
-typedef enum {
+typedef enum UNumberFormatSymbol {
   /** The decimal separator */
   UNUM_DECIMAL_SEPARATOR_SYMBOL,
   /** The grouping separator */
diff --git a/icu4c/source/i18n/unicode/uregex.h b/icu4c/source/i18n/unicode/uregex.h
index 84dc1eb4b4a..6a44080c6ca 100644
--- a/icu4c/source/i18n/unicode/uregex.h
+++ b/icu4c/source/i18n/unicode/uregex.h
@@ -46,7 +46,7 @@ typedef struct URegularExpression URegularExpression;
  * Constants for Regular Expression Match Modes.
  * @stable ICU 2.4
  */
-typedef enum {
+typedef enum URegexpFlag{
     /** Forces normalization of pattern and strings. 
     Not implemented yet, just a placeholder, hence draft. 
     @draft ICU 2.4 */
diff --git a/icu4c/source/i18n/unicode/utmscale.h b/icu4c/source/i18n/unicode/utmscale.h
index 7d0972dfc7c..36d4ea493d6 100644
--- a/icu4c/source/i18n/unicode/utmscale.h
+++ b/icu4c/source/i18n/unicode/utmscale.h
@@ -192,7 +192,7 @@
  *
  * @draft ICU 3.2
  */
-typedef enum  {
+typedef enum UDateTimeScale {
     /**
      * Used in the JDK. Data is a Java <code>long</code> (<code>int64_t</code>). Value
      * is milliseconds since January 1, 1970.
@@ -281,7 +281,7 @@ typedef enum  {
  *
  * @draft ICU 3.2
  */
-typedef enum  {
+typedef enum UTimeScaleValue {
     /**
      * The constant used to select the units vale
      * for a time scale.
diff --git a/icu4c/source/i18n/unicode/utrans.h b/icu4c/source/i18n/unicode/utrans.h
index 0cb5a2994a9..a460a34c5b7 100644
--- a/icu4c/source/i18n/unicode/utrans.h
+++ b/icu4c/source/i18n/unicode/utrans.h
@@ -73,7 +73,7 @@ typedef void* UTransliterator;
  * B to A when operating in the reverse direction.
  * @stable ICU 2.0
  */
-typedef enum  {
+typedef enum UTransDirection {
     
     /**
      * UTRANS_FORWARD means from &lt;source&gt; to &lt;target&gt; for a