Family name Oneldo (Oneldo 
) , around the world, is an extremely rare surname. The last name Oneldo is habitual in Latin America and the Caribbean, particularly Honduras, where it is a very rare surname, Venezuela, where it is an extremely rare surname, and Mexico. In absolute terms, it is the most numerous in Mexico, Philippines, and Honduras. More prevalently, Oneldo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oneldo | Mexico, Brazil, Argentina, Ecuador, Philippines |