Cognomen Rainer (Rainer 
, Раинер 
, Райнер 
) , throughout the world, is a common surname. The cognomen Rainer is habitual in Austria, where it is quite a common surname, Liechtenstein, and British Virgin Islands. In absolute terms, it most frequently occurs in Austria, the United States, and Germany. More prevalently, Rainer is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rainer | Austria, Germany, Italy, Brazil, United States |
| Раинер | Russia |
| Райнер | Ukraine, Estonia, Bulgaria, Russia, Kyrgyzstan |
| ריינר | Israel |
| gregor rainer (b. 1500) |
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| bonaventura rainer (1713-1792), AT (b. 1713) |
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ján juraj rainer SK (b. 1800) |
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| georg rainer (1761-1831) (b. 1761) |
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| moriz von undzu haarbach rainer botanist (1793-1847) (b. 1793) |
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| johann baptist rainer (b. 1790) |
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| rudolph rainer (1806-1830), AT (b. 1806) |
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| rainer jános györgy HU (b. 1800) |
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| franz rainer AT (b. 1802) |
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| peter paul joseph rainer (b. 1808) |
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| ludwig rainer (1821-1893), AT (b. 1821) |
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virgil rainer Austrian sculptor, AT (b. 1871) |
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| clementine von rainer Austrian painter, AT (b. 1824) |
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francisc iosif rainer Romanian pathologist, physiologist and anthropologist, RO (b. 1874) |
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josef rainer Austrian politician (1881-1962), AT (b. 1881) |
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Beck, Wagner, Müller, Schulze, Schmidt, Schmitt, Schmitz, Schwarz, Krüger, Richter, Lehmann, Neumann, Hofmann, Fischer, Winkler, Schubert, Schäfer, Hartmann, Herrmann, Hoffmann, Schröder, Schneider, Franke, König, Krause, Keller, Koch, Lang, Jung, Wolf, Mayer, Meyer, Silva, Simon, Bauer, Braun, Friedrich, Klein, Vogel, Frank, Fuchs, Weber, Martin, Santos, Schulz, Schmid, Scholz, Becker, Lange, and Zimmermann