Cognomen Fassnacht (Fassnacht 
) , around the world, is quite a rare family name. The cognomen Fassnacht is habitual in Switzerland, where it is quite a rare surname, Germany, where it is a rare surname, and Uruguay. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Switzerland.
| VARIANT | COUNTRY |
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| Fassnacht | Germany, Canada, France, United States, Switzerland |
| josef fassnacht DE (b. 1873) |
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| max fassnacht (b. 1888) |
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hans fassnacht German swimmer, DE (b. 1950) |
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| robert fassnacht American physicist, US (b. 1937) |
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christian fassnacht Swiss association football player, CH (b. 1993) |
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| martin fassnacht German economist, DE (b. 1965) |
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| christopher d fassnacht researcher |
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| ottilie fassnacht Abt 1523 in Württemberg - 29 Jun 1603 Backnang |
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| steven fassnacht researcher ORCID ID = 0000-0002-5270-8049 |
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| daniel b. fassnacht researcher |
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| christina fassnacht researcher |
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| martin fassnacht researcher, ORCID id # 0000-0001-6170-6398 |
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| al fassnacht college basketball player (1947–1948) Colgate |
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| aidan fassnacht American racing driver |
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| fabian fassnacht researcher ORCID ID = 0000-0003-1284-9573 |
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