Last name Sumo-Ay (Sumo-Ay 
) , all over the world, is an extremely rare surname. The cognomen Sumo-Ay is habitual in South-eastern Asia, particularly Philippines, where it is an extremely rare surname. Parts of the name also exists independently as a first name Sumo, and a last name Ay.
| VARIANT | COUNTRY |
|---|---|
| Sumo-Ay | Philippines |