Family name Koosis (Koosis 
) , around the world, is a very rare cognomen. The last name Koosis is habitual in the United States, where it is an extremely rare surname, Canada, and Brazil.
| VARIANT | COUNTRY |
|---|---|
| Koosis | Canada, Brazil, United States |
| paul koosis Ph.D. University of California, Berkeley 1954 (b. 1929) |
|