Surname Tadeo (Tadeo 
, Thaddaeus 
, Фаддей 
) , around the world, is a common family name. The family name Tadeo is habitual in Philippines, where it is quite a common surname, Mexico, and El Salvador (explore the name in all countries). In absolute terms, this name is the most popular in Mexico, Philippines, and Peru. Much less frequently, Tadeo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tadeo | Philippines, Tanzania, Mexico, Peru, Uganda |
| Thaddaeus | Philippines, Spain, United States, Kenya, Nigeria |
| Фаддей | Ukraine, Russia, Kazakhstan, Belarus |
| tadeo gaddi painter (1300-1366) (b. 1300) |
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| tadeo xavier henis Spanish missionary, ES (b. 1711) |
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| tadeo portales y borda Chilean nobleman (Count of Villaminaya), CL (b. 1734) |
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tadeo ubón ES (b. 1779) |
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| tadeo ortega ES (b. 1749) |
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tadeo amorena ES (b. 1819) |
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| tadeo ortiz de ayala MX (b. 1788) |
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| tadeo davila Peruvian lawyer, PE (b. 1800) |
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| tadeo lafuente gómez ES (b. 1800) |
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tadeo de wiesent (b. 1858) |
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| tadeo biela ES (b. 1872) |
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| tadeo gomez Guitar builder (b. 1902) |
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| enrique navarro tadeo (b. 1894) |
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| giorgio tadeo Italian singer, IT (b. 1929) |
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tadeo garcía zalazar AR (b. 1975) |
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