Surname เหตุผล (Reas 
, เหตุผล 
, Reasons 
) , in the world, is quite a rare family name. The surname เหตุผล is characteristic of Philippines, where it is quite a rare surname, Bolivia, and Oman, where it is a rare surname. Not in comparison with a country's population, the name is most common in Philippines, the United States, and Indonesia. Very seldom, เหตุผล is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Reas | Indonesia, Saudi Arabia, Bolivia, Philippines, United States |
| เหตุผล | Thailand |
| Reasons | United Kingdom, Australia, United States, India, Myanmar |
| Reasonda | Indonesia, Philippines, Singapore, United States, New Zealand |
Andreasson, Kasonsit, Raison, Reason, Reasonthiah, Thanason, and Thanossason