Last name ประสุข (Prasuk 
, ประสุข , Prasook 
) , all over the world, is an extremely rare family name. The last name ประสุข is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Predominantly, ประสุข is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Prasuk | India, Thailand, Australia |
| ประสุข | Thailand |
| Prasook | United States, Thailand |
รัตนพันธ์, หรรษาวงศ์ทอง, and ศรีจันทร์