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Cognomen Tadas (Tadas
, Тадас
, タダス
) , in the world, is a common family name. The last name Tadas is characteristic of Lithuania, where it is quite a rare surname, India, and Japan, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in India, Japan, and Philippines. Much less frequently, Tadas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tadas | Philippines, India, Lithuania, United States, United Kingdom |
| Тадас | Kazakhstan, Lithuania, Russia, Ukraine |
| タダス | Japan |
| تاداس | Iran |