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Surname 小泉 (Xiaoquan , 小泉 , Koizumi ) , around the globe, is quite a rare family name. The family name 小泉 is habitual in Singapore, where it is a rare surname, Taiwan, and Japan. Measured by absolute frequency, the name is most common in China, Japan, and Indonesia. More prevalently, 小泉 is the forename as well as the last name.