Tadeusz is a Polish masculine given name derived from the Slavic element 'tata' meaning 'father'. It has been used since medieval times and was popular among nobility during the Middle Ages. In English, it is often transliterated as "Tadusz" or anglicized to "Tad". The name gained international recognition through prominent figures such as Tadeusz Kościuszko, a Polish-Lithuanian military engineer and patriot who fought for independence from Russia, and Tadeusz Różewicz, a renowned Polish poet and playwright.
The name Tadeusz has seen varied popularity over the years, with peaks occurring in 1917 (26 births), 1925 (15 births), and 1962 (10 births). However, it is important to note that there were no recorded births of this name between 1930 and 1980. Since then, the popularity has been fluctuating with a general downward trend, reaching its most recent peak in 2022 with 13 births. Overall, there have been 418 recorded births with the name Tadeusz since 1912.