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 | United States, Switzerland, Mexico, Philippines, Ethiopia |
| Тадеос | Ukraine, Armenia |