Family name Киен (Kien 
, Kyen 
, Kiyen 
) , around the world, is a common surname. The cognomen Киен is habitual in Malaysia, where it is quite a common surname, Vietnam, where it is quite a rare surname, and Macao. Not in comparison with a country's population, this name is the most popular in South-eastern Asia, particularly Malaysia, Vietnam, and Indonesia. Also, Киен is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kien | Vietnam, Cameroon, United States, Indonesia, Malaysia |
| Kyen | Canada, United States, Indonesia, Malaysia, China |
| Kiyen | United States, Indonesia, Canada, Philippines |
| Киен | Russia, Belarus |