Throughout the world, Туиен (Tuyen 
, Tuien , Туиен 
) is a common gender-neutral first name. The forename Туиен is habitual in Macao, where it is quite a common unisex name, Vietnam, where it is quite a common largely boy's, but uncommonly female name, and Australia, where it is a rare epicene name. Measured by absolute frequency, this name is the most popular in Vietnam, the United States, and Japan. Also, Туиен is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Tuyen | Taiwan, Vietnam, Malaysia, United States, Japan |
| Tuien | United States, Malaysia |
| Туиен | Russia |