Cognomen Gast (Gasto 
, Gast 
, Гаст 
) , in the world, is a common last name. The surname Gast is characteristic of Germany, where it is quite a rare surname, Netherlands, and Tanzania. In absolute terms, the name is most common in Germany, the United States, and Tanzania. Very seldom, Gast is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gasto | Tanzania, Argentina, United States, France, Paraguay |
| Gast | Switzerland, Netherlands, United States, France, Germany |
| Гаст | Ukraine, Russia, Kazakhstan |
| luce de gast Reputed author of the first part of the French poem, Tristan (b. 1190) |
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| matías gast BE (b. 1501) |
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| johann gast DE (b. 1501) |
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| michel de gast BE (b. 1509) |
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| michiel gast BE (b. 1515) |
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| abraham gast (b. 1570) |
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| barend jacobsz. gast (b. 1630) |
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| john gast born 1715; died 1788 (b. 1715) |
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| john gast (1716-1788) (b. 1716) |
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| john gast (b. 1715) |
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| jean gast (b. 1716) |
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| johann george gast organ builder, DE (b. 1755) |
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august gast German-American lithographer (1819–1891), DE (b. 1819) |
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| john gast activist (b. 1772) |
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| johann friedrich ii. gast organ builder, DE (b. 1815) |
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