Surname Seisan (Seisan 
) , across the world, is a very rare family name. The surname Seisan is habitual in Finland, where it is a rare surname, New Zealand, where it is a very rare surname, and Australia. Not in comparison with a country's population, the name is most common in the United States, Australia, and Finland. Predominantly, Seisan is the forename as well as the last name.
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