Koiwai

 ( Japanese-language Surnames ) 

Koiwai (written: 小岩井 lit "small rock well") is a Japanese surname. Notable people with the surname include:

• Eichi Karl Koiwai (1920–2009), American judoka
• born 1990, Japanese voice actress
• born 1975, Japanese figure skater
• Sakura Koiwai (小祝さくら, born 1998), Japanese golfer

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Fictional characters

• 小岩井 四葉, titular character of the manga series Yotsuba&!

• Yoshino Koiwai, character from Masamune-kun's No Revenge series

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See also

• Koiwai Station, a railway station in Takizawa, Iwate Prefecture, Japan
• Kowiai language, also spelled Koiwai

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