Surname Olff (Olff 
) , in the entire world, is a rare last name. The surname Olff is habitual in Western Europe, particularly Netherlands, where it is a rare surname, Germany, where it is a very rare surname, and France. In absolute terms, it is commonest in the United States, Germany, and Netherlands. Very seldom, Olff is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Olff | Netherlands, France, United States, China, Germany |
| johann friedrich daniel olff German theologian, DE (b. 1725) |
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| maria olff Dutch Righteous Among the Nations, NL (b. 1897) |
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| cornelis olff Dutch Righteous Among the Nations, NL (b. 1899) |
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| han olff researcher, NL (b. 1962) |
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| marc olff |
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| helios olff |
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Rob, Sharon, Silvia, Amanda, Acelia, Regina, Dennis, Debbie, Didier, Lesley, Jaimie, Nathan, Edward, Eileen, Harald, Harvey, Olivia, Marlijn, Michael, Colinda, Claudia, Cynthia, Martin, Marion, Wayne, Hulya, J P, Tim, Uwe, Marc, Mary, Maia, Kiel, Ryan, Jean, Judy, Bernard, Nina, Marja, Shane, Anton, Carol, Kitty, Paula, Gerry, Julia, Tammy, Nancy, Marta, and Raymond