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Cognomen Sunaga (Sunaga , 須永 , Сунага ) , in the entire world, is a rare family name. The last name Sunaga is habitual in Hong Kong, where it is a rare surname, Estonia, and Japan, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, Japan, and Brazil. Likewise, Sunaga is the forename as well as the last name.