Cognomen ฤดา (Ruda 
, ฤดา 
) , around the world, is a common surname. The cognomen ฤดา is habitual in Albania, where it is quite a rare surname, Georgia, and Estonia. Not in comparison with a country's population, it is commonest in Philippines, Colombia, and Poland. Also, ฤดา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ruda | Colombia, Philippines, Poland, United States, India |
| ฤดา | Thailand |