Cognomen ตรา (Tra 
, ຕາ 
, ត្រា 
) , all around the world, is a common last name. The family name ตรา is characteristic of Ivory Coast, where it is quite a common surname, Senegal, where it is quite a rare surname, and Laos. Not in comparison with a country's population, this name is the most popular in Ivory Coast, Vietnam, and India. Likewise, ตรา is the forename as well as the last name.