Surname Onică (Onică 
) , throughout the world, is a very rare cognomen. The family name Onică is characteristic of Eastern Europe, particularly Romania, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Onică | Romania |
| constantin onică Ph.D. Texas A&M University 2005, RO |
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| petrică onică Romanian politician from Horodnic de Jos, Suceava County, RO |
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| nicolae onică Romanian weightlifter, RO (b. 1993) |
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