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In the world, Seinn (Sein , Sen , Seinn ) is a common gender-neutral given name. The given name Seinn is characteristic of Mongolia, where it is a common principally boy's, but scarcely girly name, Macao, where it is quite a rare feminine name, and Maldives, where it is quite a rare male name. Measured by absolute frequency, this name is the most popular in Mongolia, India, and Indonesia. More frequently, Seinn is the last name as well as the forename.
Seinn is also a name for the fictitious and mythical characters: Sen , the fictional character from Granblue Fantasy; Sen Dunsidan , character in Shannara; sein Vetter , the operatic character in the operetta Abschiedswalzer; Sein Jünger , the operatic character in the opera Der Golem and Sein Sekretär , the operatic character in the opera Der junge Lord, among other works.