Throughout the world, Rainer (Rainer 
, Раинер 
, Райнер 
) is a widespread male given name. The given name Rainer is habitual in Germany, where it is a common boy's name, Austria, where it is quite a common masculine name, and Estonia, where it is quite a rare boy's name. In absolute terms, it is commonest in Germany, Austria, and Brazil. Much less frequently, Rainer is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Rainer | Brazil, Italy, Austria, United States, Germany |
| Раинер | Russia |
| Райнер | Estonia, Russia, Bulgaria, Kyrgyzstan, Ukraine |
| ריינר | Israel |
Rainer is also a name for the fictitious and mythical characters: .
| rainer guldin CH (b. 1054) |
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| rainer fabricius (b. 1532) |
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rainer joseph von österreich Austrian archduke (1783-1853), IT (b. 1783) |
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| rainer wottawa (1742-1779) (b. 1742) |
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rainer ferdinand von österreich Archduke of Austria (1827-1913), AT (b. 1827) |
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| rainer graf botanist (1811-1872) (b. 1811) |
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| kamillus martin rainer AT (b. 1802) |
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| kamillus rainer (b. 1802) |
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carl rainer simons German singer (1869-1934), DE (b. 1869) |
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| rainer schmerling AT (b. 1811) |
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rainer maria rilke Austrian poet and writer (1875–1926), AT (b. 1875) |
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| rainer erzherzog von österreich (1842-1844) (b. 1842) |
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rainer fetscher German university teacher (1895-1945), DE (b. 1895) |
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| rainer vuorio Finnish jurist and singer (1856-1916), FI (b. 1856) |
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rainer ahonius FI (b. 1896) |
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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