Last name Yahiro-O'Neill (Yahiro-O'Neill 
) , all over the world, is an extremely rare family name. The surname Yahiro-O'Neill is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. Parts of the name also exists independently as a first name Yahiro, and a last name O'Neill.
| VARIANT | COUNTRY |
|---|---|
| Yahiro-O'Neill | United States |