Surname มนต์ฤทัย (Monruthai 
, มนต์ฤทัย , Monreuthai ) , in all the world, is an extremely rare last name. Predominantly, มนต์ฤทัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Monruthai, Monreuthai, มนต์ฤทัย, Monrutthai | Thailand |
Monruetai, Monruethai, Monrutai, and Montruethai