Family name Onan (Onan 
, Онан 
, โออนันต์ 
) , in the world, is quite a common last name. The cognomen Onan is habitual in Honduras, where it is quite a rare surname, Bosnia and Herzegovina, and Turkey. Not in comparison with a country's population, it is the most numerous in Turkey, the United States, and Philippines. Very seldom, Onan is the forename as well as the last name.
| charlie onan American politician – Minnesota -House 1939-42 (District 49), US (b. 1878) |
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| necmettin halil onan Turkish poet, TR (b. 1902) |
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ömer onan Turkish basketball player, TR (b. 1978) |
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| ümit süleyman onan Cypriot politician, CY (b. 1928) |
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| sacit onan TR (b. 1945) |
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| arzum onan Turkish actor and model, TR (b. 1973) |
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| onan masaoka American baseball player, US (b. 1977) |
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| ismihan selen onan researcher |
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| mehmet anıl onan researcher (ORCID 0000-0001-7643-1585) |
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| arif onan researcher |
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| aytuğ onan researcher (ORCID 0000-0002-9434-5880) |
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| cenk onan researcher, ORCID id # 0000-0001-8640-7220 |
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| nevin onan researcher |
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| elvan onan researcher (ORCID 0000-0003-1018-3464) |
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| burak onan researcher |
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