Family name ตาธรรม (Tatham 
, ตาธรรม 
) , in all the world, is quite a rare cognomen. The last name ตาธรรม is habitual in Jamaica, where it is quite a rare surname, the United Kingdom, and New Zealand. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Australia. Very seldom, ตาธรรม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tatham | Australia, Canada, Jamaica, United Kingdom, United States |
| ตาธรรม | Thailand |