Cognomen ร้าย (Rai 
, ร้าย) , all over the world, is a prevalent last name. The last name ร้าย is habitual in Bhutan, where it is a prevalent surname, Nepal, and Qatar, where it is a widespread surname (explore the name in all countries). In absolute terms, it is commonest in India, Nepal, and Saudi Arabia. Much less frequently, ร้าย is the forename as well as the last name.