Family name รัตร (Rat 
, รัตร 
) , worldwide, is a common cognomen. The surname รัตร is habitual in Romania, where it is quite a common surname, France, where it is quite a rare surname, and Oman. Not in comparison with a country's population, the name is most common in Bangladesh, France, and Romania. Also, รัตร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rat | Romania, Bangladesh, Myanmar, France, India |
| รัตร | Thailand |