Cognomen Ρήγας (Rex 
, Regas 
, Rig 
) , all over the world, is a common surname. The cognomen Ρήγας is characteristic of Greenland, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and Macao. In absolute terms, the name is most common in the United States, Nigeria, and Germany. More prevalently, Ρήγας is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rex | Papua New Guinea, Philippines, Nigeria, United States, Democratic Republic of the Congo |
| Regas | Indonesia, United States, United Kingdom, Germany, Malaysia |
| Rig | China, Philippines, United States, Germany, Democratic Republic of the Congo |
| Ρήγας | Greece |
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ρήγας φεραίος Greek philosopher (1757-1798), GR (b. 1757) |
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ρήγας παλαμήδης Greek politician, GR (b. 1794) |
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| ήβος ρήγας Greek politician, GR (b. 1800) |
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| ρήγας κοντορήγας GR (b. 1800) |
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γεώργιος ρήγας Greek-American actor, GR (b. 1890) |
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παναγιώτης ρήγας American actor (1897-1974), US (b. 1897) |
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σταύρος ρήγας Greek army officer, GR (b. 1905) |
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| γεώργιος ρήγας Greek folklorist and priest, GR (b. 1884) |
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| ρήγας γκόλφης Greek poet, GR (b. 1886) |
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| γιώργος ρήγας Greek painter, GR (b. 1921) |
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| ρήγας ευσταθιάδης Olympic athlete, GR (b. 1931) |
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| κώστας ρήγας Greek basketball player, and basketball referee, GR (b. 1944) |
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| τάσος ρήγας greek painter, GR (b. 1944) |
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| θέμης ρήγας Greek footballer (1945-1984), GR (b. 1945) |
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| γιάννης ρήγας Greek actor and director, GR (b. 1955) |
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Σωκράτης, Χρήστος, Δημήτρης, Νίκος, Μάριος, Αλέξανδρος, Γιώργος, Βαγγέλης, Γιάννης, and Κωνσταντίνος