Quick answer
Nanami is a girl name.
Meaning and history
From Japanese 七 ( nana ) meaning "seven" and 海 ( mi ) meaning "sea". It can also come from 菜 ( na ) meaning "vegetables, greens" duplicated and 美 ( mi ) meaning "beautiful". Other kanji combinations are also possible.
Notes and context
Usage: japanese | Japanese Hiragana: ななみ; Japanese Katakana: ナナミ