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Family name サカイ (サカイ , Sakai , Sakay ) , all over the world, is a common cognomen. The family name サカイ is characteristic of Japan, where it is quite a rare surname, Singapore, and Hong Kong. Not in comparison with a country's population, it is the most numerous in Japan, Brazil, and the United States. More prevalently, サカイ is the forename as well as the last name.