Cognomen Mettr (Mett 
, Mettr 
) , around the world, is quite a rare surname. The family name Mettr is characteristic of Estonia, where it is quite a rare surname, Cyprus, and Germany, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Germany, Myanmar, and the United States. Very seldom, Mettr is the forename as well as the last name.