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Cognomen 窪田 (Kubota , Utsubo , 窪田 ) , in the world, is quite a common family name. The last name 窪田 is habitual in Paraguay, where it is quite a rare surname, Jamaica, and Singapore. Measured by absolute frequency, it is commonest in Brazil, Japan, and the United States. Very seldom, 窪田 is the forename as well as the last name.