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Family name Sonnen (Sonnen
, 索南
) , across the world, is quite a rare last name. The cognomen Sonnen is habitual in Western Europe, particularly Germany, where it is quite a rare surname, Netherlands, where it is a rare surname, and Austria. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Nigeria. Very seldom, Sonnen is the forename as well as the last name.