Cognomen Romero-Millan (Romero-Millan 
) , around the world, is an extremely rare family name. The last name Romero-Millan is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Parts of the name also exists independently as a last name Romero, and a last name Millan.
| VARIANT | COUNTRY |
|---|---|
| Romero-Millan | United States |