Quick answer
Kasumi is a girl name.
Meaning and history
From Japanese 霞 ( kasumi ) meaning "mist". It can also come from 花 ( ka ) meaning "flower, blossom" combined with 澄 ( sumi ) meaning "clear, pure". Other kanji combinations are also possible.
Notes and context
Usage: japanese | Japanese Hiragana: かすみ; Japanese Katakana: カスミ