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Cognomen Kocaj (Kocaj
, Коцай
) , in the world, is quite a rare last name. The cognomen Kocaj is habitual in Albania, where it is quite a rare surname, Poland, where it is a rare surname, and Slovakia. Measured by absolute frequency, this name is the most popular in Poland, Albania, and Ukraine. Likewise, Kocaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kocaj | Poland, Greece, Australia, Albania, United States |
| Коцай | Kazakhstan, Kyrgyzstan, Russia, Ukraine |