Cognomen Fiallegas (Fiallegas 
) , worldwide, is a very rare surname. The cognomen Fiallegas is habitual in Spain, where it is a rare surname, Switzerland, where it is a very rare surname, and Argentina. Also, Fiallegas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fiallegas | China, Spain, Switzerland, Argentina, Brazil |