Surname วันอาทิตย์ (Sunday 
, Suday 
, วันอาทิตย์ 
) , across the world, is a prevalent cognomen. The surname วันอาทิตย์ is characteristic of Nigeria, where it is a widespread surname, Iceland, where it is quite a common surname, and Namibia (explore the name in all countries). Measured by absolute frequency, the name is most common in Nigeria, Niger, and the United States. Also, วันอาทิตย์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sunday | Uganda, Niger, Tanzania, Nigeria, India |
| Suday | Philippines, United States, Tanzania, Nigeria, India |
| Sudtay, วันอาทิตย์ | Thailand |
Didsayathon, Sonday, Sundee, Sunthondee, Suraday, Suwannual, and Zunday