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Last name Tainaka (Tainaka , たいなか) , around the globe, is a very rare family name. The family name Tainaka is habitual in Canada, where it is a very rare surname, Chile, and Philippines, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Canada, the United States, and Brazil. More prevalently, Tainaka is the forename as well as the last name.