Cognomen Kozlovskyi (Kozlovskyi 
) , throughout the world, is a very rare surname. The last name Kozlovskyi is habitual in Northern Europe, particularly Latvia, where it is a rare surname, Lithuania, and Estonia. Measured by absolute frequency, it is the most numerous in Poland, Latvia, and Ukraine. Much less frequently, Kozlovskyi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kozlovskyi | Ukraine, Lithuania, Poland, Latvia, China |