Last name Cay-Uman (Cay-Uman 
) , globally, is a very rare family name. The cognomen Cay-Uman is habitual in South-eastern Asia, particularly Philippines, where it is a very rare surname. Parts of the name also exists independently as a last name Cay, and a first name Uman.
| VARIANT | COUNTRY |
|---|---|
| Cay-Uman | Philippines |