Surname Mertcalov (Mertcalov 
, Мертцалов 
) , all over the world, is a very rare cognomen. The surname Mertcalov is characteristic of Estonia, where it is a rare surname, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mertcalov | Estonia |
| Мертцалов | Russia |