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Family name Sisay (Sisay , سيساي) , in all the world, is a widespread last name. The family name Sisay is characteristic of Ethiopia, where it is a common surname, British Virgin Islands, where it is quite a common surname, and Gambia. Measured by absolute frequency, it is the most numerous in Ethiopia, Saudi Arabia, and Gambia. Likewise, Sisay is the forename as well as the last name.