Across the world, Sonnen (Sonnen 
, 索南 
) is a rare epicene first name. The forename Sonnen is habitual in Austria, where it is a rare girly name, Nigeria, where it is a very rare predominantly boy's, but scarcely girly name, and Germany, where it is a very rare girly name. Not in comparison with a country's population, it most frequently occurs in Nigeria, China, and Germany. More prevalently, Sonnen is the last name as well as the forename.