Cognomen Grega (Grega 
) , around the globe, is quite a rare family name. The cognomen Grega is characteristic of Slovakia, where it is quite a common surname, Slovenia, and Hungary, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Slovakia, the United States, and Slovenia. Also, Grega is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Grega | Sierra Leone, Poland, United States, Slovakia, Slovenia |
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grega benedik Slovenian alpine skier, SI (b. 1962) |
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| andrej grega Slovak physicist (1920-1997), SK (b. 1920) |
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| josef grega (b. 1915) |
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grega habič Slovene guitarist, SI (b. 1975) |
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| pavel grega SK (b. 1920) |
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andreas grega Swedish musician, SE (b. 1980) |
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| vincent grega (b. 1922) |
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| gustav grega SK (b. 1923) |
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grega bole road bicycle racer, SI (b. 1985) |
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grega žemlja Slovenian tennis player, SI (b. 1986) |
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grega repovž SI |
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| tadeusz grega Polish physicist (1950-2014), PL (b. 1950) |
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| andrej grega Czech member of Czech Parliament (1998–2006), CZ (b. 1950) |
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| grega forjanič SI (b. 1957) |
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| grega mastnak Grega Mastnak * 1969 , painter, draghtsman sex: male notes: Slovinský malíř a kreslíř, SI (b. 1969) |
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