Family name ธีโอดอร์ (Theodore 
, Theodoor 
, ธีโอดอร์ 
) , globally, is a common surname. The surname ธีโอดอร์ is characteristic of Latin America and the Caribbean, particularly Saint Lucia, where it is a common surname, Dominica, where it is quite a common surname, and Grenada (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, Indonesia, and Nigeria. More prevalently, ธีโอดอร์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Theodore | South Africa, Cameroon, United States, Ethiopia, Ghana |
| Theodoor | Indonesia, Canada, South Africa, France, United States |
| ธีโอดอร์ | Thailand |