Cognomen Osa (Osa 
, オサ 
, Оса 
) , all over the world, is a common last name. The surname Osa is characteristic of Equatorial Guinea, where it is quite a common surname, Estonia, where it is quite a rare surname, and Latvia. In absolute terms, it is commonest in Egypt, Nigeria, and India. Likewise, Osa is the forename as well as the last name.
| frater, osa johannes (b. 1352) |
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lars osa painter (1860-1958), NO (b. 1860) |
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simo osa Finnish actor (1873-1945), FI (b. 1873) |
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| norverto osa CO (b. 1832) |
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osa maliki wangsadinata Indonesian politician (1907–1969), ID (b. 1907) |
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osa massen Danish actress (1914-2006), DK (b. 1914) |
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| hermine bernhoft osa Norwegian writer, NO (b. 1865) |
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| aina osa finnish actress (1872-1947), FI (b. 1872) |
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eusebio osa unamuno ES (b. 1936) |
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harald osa Norwegian cook, NO (b. 1958) |
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| sigbjørn bernhoft osa Norwegian musician, NO (b. 1910) |
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erramun osa subsecretary of the Academy of Basque Language, ES (b. 1964) |
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| theodor bernhoft osa (b. 1904) |
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| verónica de bruyn-de osa (b. 1909) |
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øyvind osa Norwegian singer and musician (b. 1972) |
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