Cognomen Kailajärvi (Kailajärvi 
) , in the world, is an extremely rare surname. The family name Kailajärvi is characteristic of Northern Europe, particularly Finland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kailajärvi | Finland |
|
jouni kailajärvi Finnish weightlifter, FI (b. 1938) |
|
|
jaakko kailajärvi Finnish weightlifter, FI (b. 1941) |
|
| hannu kailajärvi FI |
|