Quick answer
Kimiko is a girl name.
Meaning and history
From Japanese 貴 ( ki ) meaning "valuable" with 美 ( mi ) meaning "beautiful" or 君 ( kimi ) meaning "lord, noble" combined with 子 ( ko ) meaning "child". Other kanji combinations are possible.
Notes and context
Usage: japanese | Japanese Hiragana: きみこ; Japanese Katakana: キミコ