Cognomen Iã (Iã 
) , globally, is a rare family name. The surname Iã is characteristic of Northern Africa, particularly Algeria, where it is a rare surname, and Egypt, where it is a very rare surname. Much less frequently, Iã is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Iã | United States, Spain, Egypt, Algeria, Brazil |
An, Castro, Bilbao, Blanco, Romero, Garcia, Ugarte, Sanchez, Alvarez, Arregui, Aguirre, Jimenez, Iriarte, Uriarte, Martinez, Gonzalez, Rodriguez, Garmendia, Alonso, Santos, Moreno, Martin, Lu, Ez, Oz, Aga, Rez, Lez, Nez, Sanz, Fernandez, Ruiz, Lmaz, Ndez, Silva, Perez, Gomez, Lopez, Nchez, Ortiz, Guez, and Etxeberria