All over the world, Tadeus (Tadeus 
, Тадеус 
) is quite a rare boy's forename. The first name Tadeus is characteristic of Namibia, where it is quite a rare male name, Lithuania, and Tanzania, where it is a rare masculine name. Not in comparison with a country's population, it is commonest in Indonesia, Germany, and Brazil. Very seldom, Tadeus is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Tadeus | Tanzania, Brazil, Namibia, Indonesia, Germany |
| Тадеус | Russia, Ukraine |
| tadeus jirka (b. 1914) |
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| tadeus calinca Spanish playwright, ES (b. 1968) |
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| tadeus dominik botanist |
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| tadeus duschek |
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| tadeus ranisch |
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