Cognomen Rajka (Rajka 
) , globally, is a rare last name. The last name Rajka is habitual in Southern Europe, particularly Bosnia and Herzegovina, where it is quite a rare surname, Slovenia, and North Macedonia, where it is a rare surname. In absolute terms, it is the most numerous in Bosnia and Herzegovina, India, and Romania. More frequently, Rajka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rajka | India, Serbia, Bosnia and Herzegovina, Croatia, Montenegro |
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péter rajka RO (b. 1807) |
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rajka lászló RO (b. 1894) |
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rajka baković BO (b. 1920) |
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| edmund rajka (1890-1971) (b. 1890) |
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| rajka ödön HU (b. 1890) |
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| georg rajka Norwegian physician, HU (b. 1925) |
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| rajka radoicić geologist working on algae and protists, RS |
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