Family name Proosa (Proosa 
) , globally, is a rare cognomen. The cognomen Proosa is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname, and Finland, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Proosa | Finland, Estonia |
| valter proosa (b. 1895) |
|
|
| hendrik proosa Estonian designer and mountaineer, EE (b. 1983) |
|