Cognomen Onassis (Onassis 
) , around the world, is a rare surname. The surname Onassis is habitual in Slovenia, where it is a rare surname, Honduras, and Venezuela. In absolute terms, it most frequently occurs in Indonesia, Mexico, and the United States. More prevalently, Onassis is the forename as well as the last name.
| socrates onassis 1866- (b. 1866) |
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athina onassis French-Greek heiress, FR (b. 1985) |
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| alexander onassis Greek businessman, son of Aristotle Onassis, US (b. 1948) |
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| beldina odenyo onassis scottish-Kenyan musician |
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| pierre onassis BR |
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