Surname Riegel (Riegel 
, Reile 
, Ригель 
) , around the globe, is a common last name. The last name Riegel is habitual in Germany, where it is quite a rare surname, Estonia, and Slovakia. Measured by absolute frequency, it is commonest in Germany, the United States, and Brazil. Much less frequently, Riegel is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Riegel | Germany, France, Brazil, Poland, United States |
| Reile | Germany, France, Argentina, Brazil, United States |
| Ригель | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| Rigli | Greece, Morocco, Argentina, Brazil, United States |
| sebastian riegel (b. 1611) |
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| christoph riegel German copper engraver, publisher and bookseller, DE (b. 1648) |
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| paul christoph riegel DE (b. 1687) |
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hermann riegel German art historian (1834-1900), DE (b. 1834) |
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| anton pius riegel Austrian architect (b. 1789) |
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dominik riegel austrian fencer (1840-1920), CZ (b. 1840) |
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| franz xaver riegel (b. 1783) |
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franz riegel German gastoenterologist, DE (b. 1843) |
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| franz michael riegel (b. 1796) |
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| albert riegel DE (b. 1802) |
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| johann michael riegel DE (b. 1807) |
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ella riegel American suffragist, US (b. 1867) |
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| františek riegel Czech postal clerk and painter (1824-1904), CZ (b. 1824) |
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| emil riegel DE (b. 1817) |
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e.c. riegel American economist (b. 1879) |
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