Last name Jermolajev (Ермолаев 
, Jermolajev 
) , in the entire world, is a common cognomen. The cognomen Jermolajev is habitual in Russia, where it is quite a common surname, Belarus, and Kazakhstan, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ермолаев | Kyrgyzstan, Russia, Kazakhstan, Belarus, Ukraine |
| Jermolajev | Czechia, Estonia, United Kingdom, Lithuania, Latvia |
Ermolaev, Jermolajew, Yermolaiev, Yermolayev, and Єрмолаєв
| vladimir jermolajev actor (1924-1991) (b. 1924) |
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| viktor jermolajev (b. 1953) |
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| alexej jermolajev RU (b. 1975) |
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