Last name Aerni (Aerni 
, Эрни 
) , in the world, is quite a rare surname. The surname Aerni is characteristic of Western Europe, particularly Switzerland, where it is quite a common surname, Austria, where it is a rare surname, and Belgium. Not in comparison with a country's population, it most frequently occurs in Switzerland, the United States, and Austria. Very seldom, Aerni is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Aerni | United States, Switzerland, Indonesia, Austria, Germany |
| Эрни | Russia, Estonia, Kazakhstan |
| johann franz aerni CH (b. 1755) |
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| franz theodor aerni Swiss painter, CH (b. 1853) |
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| werner aerni CH (b. 1907) |
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| viktor aerni CH (b. 1909) |
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| agathon aerni Swiss author (1929-2006), CH (b. 1929) |
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| klaus aerni (1932-2014), CH (b. 1932) |
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luca aerni Swiss alpine skier, CH (b. 1993) |
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| fritz aerni Swiss writer and publisher, CH (b. 1945) |
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| rené aerni CH (b. 1944) |
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| georg aerni Artist, CH (b. 1959) |
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| christoph aerni CH (b. 1954) |
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| urs heinz aerni (b. 1962) |
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| heinrich aerni (b. 1967) |
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| hans-rudolf aerni researcher |
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| s.j. aerni researcher |
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