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Surname Onen (Onen
, หนึ่ง) , in the world, is quite a common cognomen. The cognomen Onen is habitual in Sub-Saharan Africa, particularly Uganda, where it is quite a rare surname, Nigeria, and Zambia, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Uganda, Nigeria, and Turkey. Likewise, Onen is the forename as well as the last name.