Family name Vassal (Vasal 
, Vassal 
, Vasalo 
) , in all the world, is quite a rare cognomen. The surname Vassal is characteristic of France, where it is quite a rare surname, Israel, and Portugal. In absolute terms, it is commonest in France, India, and Israel. Much less frequently, Vassal is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Vasal | Israel, Canada, Spain, India, United States |
| Vassal | Democratic Republic of the Congo, India, France, United States, Portugal |
| Vasalo | Spain, Argentina, India, Brazil, United States |
| Vazal | India, United States, Germany |
| jean-antoine hubert vassal French financier and art collector; 1741-1782, FR (b. 1741) |
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| françois vassal de monviel CA (b. 1759) |
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| jacques claude roman vassal French politician, FR (b. 1770) |
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| pierre gérard vassal FR (b. 1769) |
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| rené vassal (b. 1780) |
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| rené claire vassal FR (b. 1780) |
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| élisabeth vassal (b. 1795) |
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| jean françois vassal FR (b. 1853) |
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| joseph vassal French physician (b. 1867) |
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| victor vassal French lawyer and official (1870-1915), FR (b. 1870) |
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| auguste vassal FR (b. 1864) |
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| jean vassal French politician, FR (b. 1876) |
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| gabrielle maud vassal British naturalist, GB (b. 1880) |
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lucien vassal French writer, FR (b. 1937) |
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jean-philippe vassal French architect, FR (b. 1954) |
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