Family name Oncea (Oncea 
) , worldwide, is a rare cognomen. The surname Oncea is habitual in Moldova, where it is quite a rare surname, Romania, and Canada, where it is a very rare surname. In absolute terms, this name is the most popular in Romania, Moldova, and the United States. Very seldom, Oncea is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oncea | Canada, Moldova, Poland, United States, Romania |
| ioan oncea Romanian politician, RO (b. 1936) |
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| ștefan oncea Romanian politician from Poienile de sub Munte, Maramureș County, RO |
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Sam, Ioana, Marius, Samuel, Stefan, Adrian, Cheryl, Rodica, Denisa, Daniel, George, Laurie, Lenuta, Joanne, Jennie, Judith, Vasile, Victor, Ileana, Ivonka, Ofelia, Wiorel, Ionut, Melanie, Elena, Jayne, Ana, Ian, Sean, Alex, Alin, Cami, Jack, John, Ivan, Igor, Ioan, Maria, Mihai, Sanda, Scott, Brian, Patti, David, Laura, Lynne, James, Jerry, and Michael