Last name كوسوف (Kosov 
, Kossof 
, Kossoff 
) , worldwide, is a rare surname. The cognomen كوسوف is characteristic of Albania, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Slovenia. In absolute terms, this name is the most popular in Russia, the United States, and the United Kingdom. Much less frequently, كوسوف is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kosov | Russia, United Kingdom, United States, Albania, Bulgaria |
| Kossof | New Zealand, Philippines, United States |
| Kossoff | Canada, United Kingdom, United States, France, Australia |