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Surname Merila (Merila , مريلا , מרילה ) , in the entire world, is a rare family name. The surname Merila is characteristic of Northern Europe, particularly Estonia, where it is quite a common surname, Finland, where it is quite a rare surname, and Latvia, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Estonia, Finland, and the United States. More frequently, Merila is the forename as well as the last name.