Cognomen รุทร (Rut 
, รุทร 
) , all around the world, is a common last name. The family name รุทร is habitual in Israel, where it is a common surname, Iceland, where it is quite a common surname, and Honduras, where it is quite a rare surname. In absolute terms, it is the most numerous in Israel, Mexico, and Spain. More frequently, รุทร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rut | Spain, India, Israel, Indonesia, Mexico |
| รุทร | Thailand |