Family name เศรษฐี (Sethi 
, Sethai , เศรษฐี 
) , all over the world, is a widespread last name. The surname เศรษฐี is characteristic of British Virgin Islands, where it is a common surname, India, where it is quite a common surname, and United Arab Emirates. In absolute terms, it is the most numerous in India, Pakistan, and the United States. Very seldom, เศรษฐี is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sethi | United Arab Emirates, Pakistan, United Kingdom, United States, India |
| Sethai | United States, India |
| เศรษฐี | Thailand |
| Sethee | United States, India, South Africa |
Illionaire, Millionaire, Raichman, Setthi, and เศรษฐกิจ