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Cognomen Saigusa (三枝 , Saigusa ) , worldwide, is a rare last name. The cognomen Saigusa is characteristic of Ireland, where it is a rare surname, Singapore, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in China, the United States, and Ireland. More prevalently, Saigusa is the forename as well as the last name.