Cognomen Кальцоў (Koltsov 
, Кальцоў, Kolcov 
) , worldwide, is a rare family name. The last name Кальцоў is habitual in Estonia, where it is quite a rare surname, Lithuania, and Russia, where it is a rare surname. In absolute terms, this name is the most popular in Russia, Estonia, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Koltsov | Russia, Estonia, Belarus, United States, Lithuania |
| Kolcov | Ukraine, Israel, Russia, Lithuania |
|
канстанцін яўгенавіч кальцоў Belarusian ice hockey player, BY (b. 1981) |
|