Surname Klarer (Klarer 
) , all over the world, is quite a rare last name. The family name Klarer is habitual in Western Europe, particularly Switzerland, where it is quite a rare surname, Austria, where it is a rare surname, and Germany. Measured by absolute frequency, it most frequently occurs in Switzerland, the United States, and Germany. Much less frequently, Klarer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Klarer | Germany, Austria, Switzerland, United States, Canada |
| walter klarer (1500-1567), CH (b. 1500) |
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| theodor klarer (b. 1766) |
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elizabeth klarer South African writer (1910-1994), ZA (b. 1910) |
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| josef klarer German chemist and pharmacologist, DE (b. 1898) |
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| alain klarer (b. 1949) |
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| mario klarer (b. 1962) |
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| melanie klarer researcher (ORCID 0000-0002-6190-5212) |
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| stephan klarer CH (b. 1972) |
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| martin klarer German association football player, DE (b. 1982) |
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| christoph klarer Austrian association football player, AT |
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