Last name เถร (Then 
, Thera 
, เถร 
) , all around the world, is a common cognomen. The surname เถร is characteristic of the Dominican Republic, where it is quite a common surname, Mali, and Malaysia. Not in comparison with a country's population, the name is most common in Indonesia, Malaysia, and Mali. Also, เถร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Then | Dominican Republic, Malaysia, Indonesia, Myanmar, Germany |
| Thera | Indonesia, Malaysia, Mali, Myanmar, Germany |
| เถร | Thailand |