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Around the globe, としお (Toshio , としお) is quite a rare boy's given name. The first name としお is characteristic of Japan, where it is quite a rare masculine name, Canada, where it is a very rare male name, and the United States. Measured by absolute frequency, it is commonest in Japan, China, and the United States. More frequently, としお is the last name as well as the forename.
としお is also a name for the fictitious and mythical characters: Samurai , the fictional superhero in the Super Friends cartoons created by Hanna-Barbera; Toshio Saeki , the fictional character from the Ju-On franchise and Toshio Asakura , the fictional character from Touch.