Cognomen ธิยา (Thiya 
, ธิยา 
, Thiyah 
) , across the world, is quite a rare surname. The family name ธิยา is habitual in Sri Lanka, where it is quite a rare surname, Qatar, where it is a rare surname, and Myanmar. Measured by absolute frequency, this name is the most popular in India, Sri Lanka, and Indonesia. More prevalently, ธิยา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thiya | Myanmar, Sri Lanka, India, Indonesia, South Africa |
| ธิยา | Thailand |
| Thiyah | Indonesia, Israel, Thailand |