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Cognomen Cá (カ , Kā , Cá ) , around the globe, is quite a rare family name. The family name Cá is characteristic of Guinea-Bissau, where it is quite a common surname, Japan, where it is quite a rare surname, and Portugal, where it is a rare surname. In absolute terms, the name is most common in Japan, Guinea-Bissau, and Vietnam. Also, Cá is the forename as well as the last name.