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Worldwide, תדיאוש (Tadeusz , תדיאוש ) is a common masculine forename. The first name תדיאוש is characteristic of Poland, where it is a common boy's name, Aland Islands, where it is quite a common boy's name, and Germany, where it is quite a rare boy's name. Not in comparison with a country's population, this name is the most popular in Poland, Germany, and the United States. More frequently, תדיאוש is the last name as well as the forename.
תדיאוש is also a name for the fictitious and mythical characters: Tadeusz Zybert , the fictional human, Na dobre i na złe; Tadeusz Soplica , the fictional character, Pan Tadeusz and Tadeusz Norek , character in Miodowe lata.