Family name Onofrei (Onofrei 
, Онофрей 
) , all around the world, is quite a common last name. The cognomen Onofrei is characteristic of Romania, where it is quite a common surname, Moldova, and Ireland, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Romania, Moldova, and Ukraine. Very seldom, Onofrei is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Onofrei | Moldova, Romania, Spain, Italy, United States |
| Онофрей | Ukraine, Belarus, Moldova, Russia, Kazakhstan |
| dimitrie onofrei Romanian opera singer (1897-1991), RO (b. 1897) |
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| mihai onofrei (b. 1896) |
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| cristina onofrei Romanian rower, RO (b. 1950) |
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| olguța onofrei Romanian rower, RO (b. 1950) |
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| orest onofrei Romanian politician, RO (b. 1957) |
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| constantin onofrei boxer, RO (b. 1976) |
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| daniel t. onofrei Ph.D. Worcester Polytechnic Institute 2007 |
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| roxana onofrei researcher |
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| silvia elena onofrei Ph.D. Kansas State University 2003 |
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| cristian onofrei Romanian rugby unnion player, RO (b. 1987) |
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| octavian onofrei association football player, MD (b. 1991) |
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