Cognomen Myrsa (Myrsa 
, Мирса 
) , all over the world, is a very rare surname. The last name Myrsa is characteristic of Mexico, where it is a very rare surname, Nicaragua, and Russia, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Mexico, Russia, and the United States. More frequently, Myrsa is the forename as well as the last name.