Family name Тхиен (Thien 
, Тхиен 
, Txien) , throughout the world, is a common last name. The surname Тхиен is characteristic of South-eastern Asia, particularly Brunei, where it is quite a common surname, Malaysia, and Vietnam, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Vietnam, Malaysia, and Germany. Also, Тхиен is the forename as well as the last name.