Family name ธิชัย (ธิชัย 
, Thichai 
) , in the entire world, is a very rare surname. The last name ธิชัย is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Also, ธิชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ธิชัย | Thailand |
| Thichai | United States, Thailand |