Family name Casamayo (Casamayo 
) , around the globe, is a very rare surname. The last name Casamayo is characteristic of Philippines, where it is a very rare surname, Peru, and Argentina, where it is an extremely rare surname. Very seldom, Casamayo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Casamayo | Peru, Spain, Philippines, Argentina |