diff --git a/icu4c/source/data/unit/en.txt b/icu4c/source/data/unit/en.txt
index 1a25589c05c4c91405863bad68ea01b06986fdc0..fc96b809ad84ff202ee9e4df9a24a6e4809210af 100644
--- a/icu4c/source/data/unit/en.txt
+++ b/icu4c/source/data/unit/en.txt
@@ -1247,9 +1247,9 @@ en{
                 other{"{0}kb"}
             }
             kilobyte{
-                dnam{"kB"}
-                one{"{0}kB"}
-                other{"{0}kB"}
+                dnam{"KB"}
+                one{"{0}KB"}
+                other{"{0}KB"}
             }
             megabit{
                 dnam{"Mb"}
@@ -2221,9 +2221,9 @@ en{
                 other{"{0} kb"}
             }
             kilobyte{
-                dnam{"kByte"}
-                one{"{0} kB"}
-                other{"{0} kB"}
+                dnam{"KByte"}
+                one{"{0} KB"}
+                other{"{0} KB"}
             }
             megabit{
                 dnam{"Mbit"}
diff --git a/icu4c/source/data/unit/es.txt b/icu4c/source/data/unit/es.txt
index 275528ab722023c880ca3879d88d42c1c2090aa6..1e648a0c93a872d0150bcd9d793bacc2b7008b76 100644
--- a/icu4c/source/data/unit/es.txt
+++ b/icu4c/source/data/unit/es.txt
@@ -1437,8 +1437,8 @@ es{
                 other{"{0}kb"}
             }
             kilobyte{
-                one{"{0}kB"}
-                other{"{0}kB"}
+                one{"{0}KB"}
+                other{"{0}KB"}
             }
             megabit{
                 one{"{0}Mb"}
@@ -2371,9 +2371,9 @@ es{
                 other{"{0} kb"}
             }
             kilobyte{
-                dnam{"kB"}
-                one{"{0} kB"}
-                other{"{0} kB"}
+                dnam{"KB"}
+                one{"{0} KB"}
+                other{"{0} KB"}
             }
             megabit{
                 dnam{"Mb"}
diff --git a/icu4c/source/data/unit/fr.txt b/icu4c/source/data/unit/fr.txt
index 846ca17435d05bebdabf7ecd0205f5e01be363d9..eab7226516f61ef85801a79f9b319e95ba3743f0 100644
--- a/icu4c/source/data/unit/fr.txt
+++ b/icu4c/source/data/unit/fr.txt
@@ -1418,9 +1418,9 @@ fr{
                 other{"{0}kbit"}
             }
             kilobyte{
-                dnam{"ko"}
-                one{"{0}ko"}
-                other{"{0}ko"}
+                dnam{"Ko"}
+                one{"{0}Ko"}
+                other{"{0}Ko"}
             }
             megabit{
                 dnam{"Mbit"}
@@ -2357,9 +2357,9 @@ fr{
                 other{"{0} kbit"}
             }
             kilobyte{
-                dnam{"ko"}
-                one{"{0} ko"}
-                other{"{0} ko"}
+                dnam{"Ko"}
+                one{"{0} Ko"}
+                other{"{0} Ko"}
             }
             megabit{
                 dnam{"Mbit"}
diff --git a/icu4c/source/data/unit/ko.txt b/icu4c/source/data/unit/ko.txt
index d3419b84bba311d7c96455d75e0340f5a84e5cb9..19767bb75371345a4f42e64bdc5bb23fc3512242 100644
--- a/icu4c/source/data/unit/ko.txt
+++ b/icu4c/source/data/unit/ko.txt
@@ -1363,8 +1363,8 @@ ko{
                 other{"{0}kb"}
             }
             kilobyte{
-                dnam{"kB"}
-                other{"{0}kB"}
+                dnam{"KB"}
+                other{"{0}KB"}
             }
             megabit{
                 dnam{"Mb"}
diff --git a/icu4c/source/data/unit/root.txt b/icu4c/source/data/unit/root.txt
index 1e27363dfbb901325f3a44f0cfde9dfb646626e8..71753e9ba9dc16fdc245db39b3855ee2cb1eeedf 100644
--- a/icu4c/source/data/unit/root.txt
+++ b/icu4c/source/data/unit/root.txt
@@ -221,8 +221,8 @@ root{
                 other{"{0} kb"}
             }
             kilobyte{
-                dnam{"kB"}
-                other{"{0} kB"}
+                dnam{"KB"}
+                other{"{0} KB"}
             }
             megabit{
                 dnam{"Mb"}
diff --git a/icu4c/source/data/unit/ru.txt b/icu4c/source/data/unit/ru.txt
index 2bb3282ac796990356e029ccc5b0b8b0cd7ea95b..b34edae955e2ac1884f41c821e30ff7f27fd92b4 100644
--- a/icu4c/source/data/unit/ru.txt
+++ b/icu4c/source/data/unit/ru.txt
@@ -8173,11 +8173,11 @@ ru{
                 other{"{0} кбит"}
             }
             kilobyte{
-                dnam{"кБ"}
-                few{"{0} кБ"}
-                many{"{0} кБ"}
-                one{"{0} кБ"}
-                other{"{0} кБ"}
+                dnam{"КБ"}
+                few{"{0} КБ"}
+                many{"{0} КБ"}
+                one{"{0} КБ"}
+                other{"{0} КБ"}
             }
             megabit{
                 dnam{"Мбит"}
diff --git a/icu4c/source/data/unit/ug.txt b/icu4c/source/data/unit/ug.txt
index b460767a5f6bd28c4f1e0e5d1f4796051965c65b..3c39bfc1efd16fc1e66c07a37d8eca5ab394b49c 100644
--- a/icu4c/source/data/unit/ug.txt
+++ b/icu4c/source/data/unit/ug.txt
@@ -263,9 +263,9 @@ ug{
                 other{"{0}kb"}
             }
             kilobyte{
-                dnam{"kByte"}
-                one{"{0}kB"}
-                other{"{0}kB"}
+                dnam{"KByte"}
+                one{"{0}KB"}
+                other{"{0}KB"}
             }
             megabit{
                 dnam{"Mbit"}
diff --git a/icu4c/source/data/unit/zh_Hant.txt b/icu4c/source/data/unit/zh_Hant.txt
index 292bdd95e5da24dcef4c9b1f8200ab8758f78c8a..c60b82eead82418c484b4fe5bab2118d2e18598a 100644
--- a/icu4c/source/data/unit/zh_Hant.txt
+++ b/icu4c/source/data/unit/zh_Hant.txt
@@ -214,8 +214,8 @@ zh_Hant{
                 other{"{0} kb"}
             }
             kilobyte{
-                dnam{"kB"}
-                other{"{0} kB"}
+                dnam{"KB"}
+                other{"{0} KB"}
             }
             megabit{
                 dnam{"Mb"}
@@ -1004,8 +1004,8 @@ zh_Hant{
                 other{"{0}kb"}
             }
             kilobyte{
-                dnam{"kB"}
-                other{"{0}kB"}
+                dnam{"KB"}
+                other{"{0}KB"}
             }
             megabit{
                 dnam{"Mb"}
@@ -1789,8 +1789,8 @@ zh_Hant{
                 other{"{0} kb"}
             }
             kilobyte{
-                dnam{"kB"}
-                other{"{0} kB"}
+                dnam{"KB"}
+                other{"{0} KB"}
             }
             megabit{
                 dnam{"Mb"}