Surname Greña (Greña 
) , in the world, is a very rare family name. The cognomen Greña is habitual in Latin America and the Caribbean, particularly the Dominican Republic, where it is a rare surname, and Argentina, where it is a very rare surname. Much less frequently, Greña is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Greña | Argentina, Dominican Republic, Spain |