Cognomen ธรรมทาน (Thamit 
, ธรรมทาน , Thummathan ) , all around the world, is a very rare surname. The last name ธรรมทาน is characteristic of South-eastern Asia, particularly Brunei, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Thailand. Likewise, ธรรมทาน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thamit | India, Brunei, Malaysia, Thailand |
| Thummathan, ธรรมทาน, Thamthanoo | Thailand |
Boodthanom, Dhammadana, Ratthamma, Tammatan, Tammathan, Tamtanta, Thamakhum, Thamaktun, Thamathad, Thammanam, Thammanpam, Thammanum, Thammaronk, Thammatan, Thammathanya, Thammathon, Thammatod, Thammaton, Thamtan, Thamtanat, Thamthan, Thamthanom, Thamthanta, Thummatan, Thummatanta, and Thumthan