Cognomen Janrut (Janrut 
) , across the world, is an extremely rare family name. The cognomen Janrut is characteristic of Thailand, where it is an extremely rare surname, and India. More frequently, Janrut is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janrut | India, Thailand |
Muangthee, and Chiammanisakul