Surname Firzlaff (Firzlaff 
) , across the world, is a rare cognomen. The surname Firzlaff is characteristic of Germany, where it is a rare surname, Austria, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Firzlaff | Germany, Austria, Brazil, United States |
| karl firzlaff German politician and carpenter (1846-1912), DE (b. 1846) |
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| paul firzlaff PL (b. 1866) |
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| hans firzlaff PL (b. 1921) |
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| uwe firzlaff researcher |
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| christine firzlaff |
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| barbara firzlaff |
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