Surname Vadya (Vadya 
, Вадя 
) , all around the world, is a rare last name. The cognomen Vadya is characteristic of India, where it is a very rare surname, Indonesia, and Israel. Measured by absolute frequency, it is the most numerous in India, Indonesia, and the United States. More frequently, Vadya is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vadya | Canada, Russia, United States, India, Indonesia |
| Вадя | Kazakhstan, Russia, Ukraine |