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Surname 福井 (Fukui , 福井 ) , worldwide, is quite a rare last name. The surname 福井 is habitual in Cayman Islands, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Japan. Not in comparison with a country's population, it is commonest in Japan, the United States, and Brazil. Also, 福井 is the forename as well as the last name.