Family name Kosuń (Kosuń 
) , around the world, is a very rare cognomen. The surname Kosuń is habitual in Eastern Europe, particularly Poland, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kosuń | Poland |
| wojciech kosuń (b. 1981) |
|
Marta, Paweł, Maciej, Paulina, and Patrycjusz