In the entire world, Ермаков (Ермаков 
, Ermakov 
, Yermakov 
) is a very rare masculine forename. The first name Ермаков is characteristic of Russia, where it is a very rare masculine name, and China, where it is an extremely rare boy's name. Much more frequently, Ермаков is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ермаков | Kazakhstan, Belarus, Azerbaijan, Russia, Ukraine |
| Ermakov | Belarus, United States, Germany, Russia, Uzbekistan |
| Yermakov | Israel, Belarus, United States, Germany, Russia |
| Ermakoff | France, Brazil, United States, Paraguay |