Last name Mantu-Ay (Mantu-Ay 
) , throughout the world, is a very rare family name. The cognomen Mantu-Ay is habitual in South-eastern Asia, particularly Philippines, where it is a very rare surname. Much less frequently, Mantu-Ay is the forename as well as the last name. Parts of the name also exists independently as a first name Mantu, and a last name Ay.
| VARIANT | COUNTRY |
|---|---|
| Mantu-Ay | Philippines |