Cognomen Mernyj (Мерный 
, Mernyj 
) , across the world, is a rare last name. The family name Mernyj is characteristic of Lithuania, where it is quite a rare surname, Belarus, where it is a rare surname, and Russia. Very seldom, Mernyj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Мерный | Russia, Belarus |
| Mernyj | Lithuania |