Cognomen เถิน (Thoen 
, เถิน 
) , all around the world, is quite a rare last name. The cognomen เถิน is characteristic of Norway, where it is quite a rare surname, Belgium, and Netherlands. Not in comparison with a country's population, it is the most numerous in the United States, Belgium, and Netherlands. Very seldom, เถิน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thoen | Norway, Brazil, Netherlands, Belgium, United States |
| เถิน | Thailand |