NanamifJapanese 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.
Sevenm & fEnglish (Modern) From the English word for the number, derived from Old English seofon (from an Indo-European root shared by Latin septem and Greek ἑπτά (hepta)).
ShichirōmJapanese From Japanese 七 (shichi) meaning "seven" and 郎 (rō) meaning "son". This was traditionally a name given to the seventh son. Other kanji combinations can be possible.