Family name Gruia (Gruia 
, Груя 
) , all around the world, is quite a common cognomen. The surname Gruia is characteristic of Romania, where it is quite a common surname, Moldova, where it is quite a rare surname, and Albania, where it is a rare surname. In absolute terms, it is the most numerous in Romania, Italy, and Afghanistan. Much less frequently, Gruia is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gruia | Italy, Moldova, Reunion, Afghanistan, Romania |
| Груя | Kazakhstan, Russia, Ukraine |
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gheorghe gruia Romanian handball player, RO (b. 1940) |
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| ion v. gruia Romanian jurist and politician, RO (b. 1895) |
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sandu mihai gruia Romanian actor, RO (b. 1956) |
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| călin gruia Romanian writer, RO (b. 1915) |
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| charlotte gruia RO (b. 1914) |
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| stelian gruia Romanian translator, RO (b. 1933) |
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| gruia novac Romanian water polo player, RO (b. 1944) |
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| lucian gruia (b. 1950) |
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| gruia calinescu Ph.D. Georgia Institute of Technology 1998 |
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| lucian gruia botanist |
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| m. gruia arachnologist |
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| maria iuliana gruia researcher |
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| virgil-daniel gruia Romanian politician from Terpezița, Dolj County, RO |
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| gruia răzvan ciprian ionescu Romanian politician from Bretea Română, Hunedoara County, RO |
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| mihai gruia Romanian pop singer, RO (b. 1982) |
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