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Cognomen Sondag (Sondag , Sontaha , Isonto ) , all over the world, is quite a rare surname. The family name Sondag is habitual in Luxembourg, where it is quite a rare surname, Zimbabwe, and Belgium. Not in comparison with a country's population, this name is the most popular in the United States, Zimbabwe, and South Africa. Very seldom, Sondag is the forename as well as the last name.