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Cognomen Koiwa (小岩 , Koiwa
, Коива
) , around the world, is a rare surname. The family name Koiwa is characteristic of China, where it is a very rare surname, Japan, and Malaysia. In absolute terms, it is commonest in China, Japan, and Brazil. More frequently, Koiwa is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 小岩 | China |
| Koiwa | Brazil, Malaysia, Japan, United States, China |
| Коива | Russia |