Cognomen Gerlach (Gerlach 
, Gierlach 
, Gerlachus ) , across the world, is a common family name. The family name Gerlach is characteristic of Germany, where it is quite a common surname, Denmark, where it is quite a rare surname, and Austria. In absolute terms, it is the most numerous in Germany, the United States, and Brazil. Much less frequently, Gerlach is the forename as well as the last name.
| gerlach i in the niederlahngau count in the Niederlahngau (b. 1000) |
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gerlach von houthem Dutch hermit, NL (b. 1100) |
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| gerlach i of isenburg-kobern German noble (b. 1150) |
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| gerlach of isenburg German noble, 12th century (b. 1150) |
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| gerlach iii of isenburg German noble (b. 1150) |
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| gerlach i of büdingen (b. 1150) |
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| gerlach ii of büdingen (b. 1150) |
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gerlach i. German noble, DE (b. 1227) |
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gerlach i of nassau Count of Nassau (1298-1344) (b. 1280) |
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| gerlach ii of dollendorf 1325 (b. 1250) |
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| gerlach vi of isenburg-limburg Dutch noble (b. 1250) |
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| gerlach von breuberg DE (b. 1245) |
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| gerlach i von isenburg-arenfels (b. 1250) |
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| gerlach i of dollendorf (b. 1250) |
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| gerlach v von veldenz (b. 1250) |
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