Cognomen Gapp (加普 
, Gapp 
) , in all the world, is quite a rare family name. The last name Gapp is habitual in Western Europe, particularly Austria, where it is quite a common surname, Germany, where it is a rare surname, and Switzerland. Not in comparison with a country's population, it most frequently occurs in Austria, Germany, and the United States. Much less frequently, Gapp is the forename as well as the last name.
| VARIANT | COUNTRY |
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| 加普 | China |
| Gapp | Italy, United States, Germany, France, Austria |
| joseph ignatz gapp AT (b. 1701) |
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antoine gapp FR (b. 1766) |
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| anton edler von gapp Czech lawyer and university rector, AT (b. 1778) |
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jakob gapp Austrian priest (1897-1943), AT (b. 1897) |
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| aloys gapp AT (b. 1838) |
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| alois gapp AT (b. 1838) |
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| julius gapp DE (b. 1845) |
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| franz gapp German pilot and Knight's Cross recipient, DE (b. 1919) |
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| paul gapp architecture critic, US (b. 1928) |
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| adelheid gapp Austrian alpine skier, AT (b. 1966) |
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| chloé gapp researcher |
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| klaus-peter gapp Dr.-Ing. Universität des Saarlandes 1996 |
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| ericka fallon patrice gapp Peerage person ID=382842 |
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| katharina gapp researcher |
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| diana gapp |
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