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Family name Seira (Seira , セイラ ) , throughout the world, is quite a common cognomen. The surname Seira is characteristic of Japan, where it is quite a rare surname, Greece, where it is a rare surname, and Argentina. Not in comparison with a country's population, this name is the most popular in Japan, Indonesia, and Argentina. Much less frequently, Seira is the forename as well as the last name.