Last name Seyna (Seyna 
, Сеина 
) , in the entire world, is a rare family name. The cognomen Seyna is characteristic of Russia, where it is a rare surname, Nicaragua, where it is a very rare surname, and Honduras. Not in comparison with a country's population, the name is most common in Russia, India, and Indonesia. Likewise, Seyna is the forename as well as the last name.