Family name Tadeos (Tadeos 
, Тадеос 
) , all over the world, is a rare cognomen. The surname Tadeos is habitual in Armenia, where it is a rare surname, Ethiopia, and Philippines, where it is a very rare surname. Very seldom, Tadeos is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tadeos | Philippines, Switzerland, Mexico, Ethiopia, United States |
| Тадеос | Armenia, Ukraine |