Cognomen Vithiya (วิชาญ 
, Vithiya 
) , all over the world, is a rare last name. The family name Vithiya is habitual in Sri Lanka, where it is a rare surname, Thailand, where it is a very rare surname, and Malaysia. Not in comparison with a country's population, it is the most numerous in Sri Lanka, Thailand, and India. Predominantly, Vithiya is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| วิชาญ | Thailand |
| Vithiya | Australia, Malaysia, India, Singapore, Sri Lanka |