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Last name Seifu (Seifu ) , across the world, is a common surname. The cognomen Seifu is characteristic of Sub-Saharan Africa, particularly Ethiopia, where it is quite a common surname, Tanzania, where it is quite a rare surname, and Lesotho. Measured by absolute frequency, the name is most common in Ethiopia, Tanzania, and Japan. Likewise, Seifu is the forename as well as the last name.