Surname Biện (Biện 
) , throughout the world, is a rare last name. The cognomen Biện is characteristic of South-eastern Asia, particularly Vietnam, where it is a rare surname. Likewise, Biện is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Biện | Vietnam |
| thông biện Vietnamese historian and Zen master (b. 950) |
|