In all the world, Undag (Undag 
) is a very rare epicene forename. The first name Undag is habitual in Philippines, where it is a very rare unisex name, and China, where it is an extremely rare boy's name. Predominantly, Undag is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Undag | Philippines, United Arab Emirates, United States, Saudi Arabia, China |
El, Rina, Riza, Rube, Ryan, Deej, Dave, Dina, Dick, Galo, Gelo, Gian, Gina, Leah, Levi, Lebe, Jael, Jose, Joan, Joel, Jhoi, Jhel, Reny, Nilo, Roel, Kyle, Fe, Mar, Mgm, Kim, Roy, Rey, Lor, Luz, Jay, Jun, Emz, Eva, Ian, Mary, Mark, Mila, Alex, Alma, Aisa, Cely, Kria, Paul, and Nida