In all the world, Ousseynou (Ousseynou 
) is a common boy's first name. The forename Ousseynou is characteristic of Sub-Saharan Africa, particularly Senegal, where it is quite a common male name, Mali, where it is quite a rare male name, and Guinea, where it is a rare male name. Not in comparison with a country's population, the name is most common in Sub-Saharan Africa, particularly Senegal, Mali, and the Democratic Republic of the Congo. Very seldom, Ousseynou is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Ousseynou | Democratic Republic of the Congo, Mali, Senegal, France, Ivory Coast |
| ousseynou ndiaga diop SN (b. 1901) |
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ousseynou thioune Senegalese association football player, SN (b. 1993) |
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ousseynou ba association football player, SN (b. 1995) |
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| ousseynou guèye Senegalese judoka (b. 1958) |
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| ousseynou ndiour association football player, SN (b. 1971) |
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| ousseynou dione German association football player, DE (b. 1973) |
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| ousseynou kane college basketball player (1998–1998) Charlotte |
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| ousseynou sarr researcher |
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| ousseynou nakoulima |
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| ousseynou bâ |
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| ousseynou fall dia |
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| ousseynou n'diaye |
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| ousseynou cissé French association football player, FR (b. 1991) |
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| ousseynou boye association football player, SN (b. 1992) |
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| ousseynou cavin diagne association football player, SN (b. 1999) |
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Sy, Wade, Mbaye, Mboup, Mbodj, Sylla, Cisse, Diouf, Dieng, Dieye, Gueye, Thiam, Toure, Niang, Ndong, Ndour, Ndoye, Camara, Cissé, Diallo, Diagne, Traore, Faye, Ndiaye, Fall, Tall, Ba, Ka, Lo, Ly, Sow, Dia, Mbow, Sane, Sall, Sarr, Samb, Sene, Seye, Seck, Coly, Ciss, Boye, Kane, Diaw, Diop, Gaye, Ngom, and Mbengue