Surname Knaff (Knaff 
) , throughout the world, is a rare family name. The surname Knaff is characteristic of Western Europe, particularly Luxembourg, where it is quite a common surname, France, where it is a rare surname, and Switzerland. Not in comparison with a country's population, it is commonest in the United States, France, and Luxembourg.
| VARIANT | COUNTRY |
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| Knaff | Switzerland, Luxembourg, France, United States, Argentina |
| philippe knaff (1822-1889) (b. 1822) |
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| jean knaff Luxembourgish politician (1825-1916), LU (b. 1825) |
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| edmond knaff (1858-1938), LU (b. 1858) |
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| albert knaff LU (b. 1859) |
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| patrick knaff French journalist, FR (b. 1958) |
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| alain knaff Luxembourg computer scientist, LU (b. 1969) |
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| pim knaff LU (b. 1965) |
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| john a. knaff American meteorologist |
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| welder knaff Brazilian table tennis player, BR |
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| laurent knaff |
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| alex knaff Luxembourgish tennis player, LU (b. 1997) |
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Mr, Dave, Gary, Lisa, Loic, Jake, John, Jody, Jean, Jeff, Rita, Juan, Tory, Teri, Tela, Troy, Nick, Nita, Ella, Edna, Eric, Jill, Rene, Kyle, Beth, Ed, Aja, Kim, Pat, Pim, Deb, Guy, Leo, Jim, Tim, Ugo, Marc, Mary, Mark, Mona, Sean, Alex, Alli, Andy, Adam, Carl, Erik, and Evan