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Cognomen トシコ (Toshiko , トシコ , Tosiko ) , around the world, is a common surname. The surname トシコ is habitual in Japan, where it is quite a common surname, Spain, where it is a very rare surname, and Indonesia. Not in comparison with a country's population, this name is the most popular in Japan, China, and Indonesia. More prevalently, トシコ is the forename as well as the last name.