Surname
Koiwai
Koiwai (小岩井) is a Japanese surname. Its kanji mean small + rock + well, and Wikidata lists 15 notable people with this family name.
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What Koiwai means
小
small
岩
rock
井
well
Where the name comes from
Like most Japanese surnames, Koiwai describes a place. Its kanji point to rocks and a well, the kind of landmark a family was known by when surnames became compulsory for everyone in 1875.