Surname Masu-Ay (Masu-Ay 
) , in the entire world, is a rare last name. The family name Masu-Ay is habitual in South-eastern Asia, particularly Philippines, where it is a rare surname. Parts of the name also exists independently as a first name Masu, and a last name Ay.
| VARIANT | COUNTRY |
|---|---|
| Masu-Ay | Philippines |