Cognomen Ruengsuksai (Ruengsuksai 
) , worldwide, is a very rare last name. The family name Ruengsuksai is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ruengsuksai | Thailand |
Peerat, Sakonrat, Thanyarat, and Yutthachai