Cognomen Koyvistoynen (Koyvistoynen 
, Койвистойнен 
) , all over the world, is a very rare surname. The cognomen Koyvistoynen is characteristic of Estonia, where it is a rare surname, Belarus, where it is a very rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Koyvistoynen | Estonia |
| Койвистойнен | Russia, Belarus |