Throughout the world, Uiller (Uiller 
) is a very rare epicene first name. The forename Uiller is habitual in Brazil, where it is an extremely rare primarily masculine, but scarcely female name, and China, where it is an extremely rare girly name. Much less frequently, Uiller is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Uiller | Costa Rica, China, Brazil, United States |