Radu is a masculine Romanian given name of Slavic origin, derived from the Old Church Slavonic root rad- (cf. радъ 'glad'). It functions as an old Romanian diminutive of Slavic names beginning with the element radŭ, meaning 'happy, willing'.Historical SignificanceRadu became widely used among Romanians due to the semi-legendary figure Radu Negru, traditionally regarded as the founder of Wallachia in the 13th century. Though much of his story is shrouded in folklore, Radu Negru's status popularized the name, which was subsequently borne by many Wallachian and some Moldavian voivodes (princes).Notable historical bearers include several rulers of Wallachia: Radu I (c. 1377–1383), Radu II (1423–1427), Radu III (known as Radu cel Frumos, or 'Radu the Fair', d. 1475), and Radu IV (1495–1508). Their reigns contributed to the name's enduring popularity in Romanian history.Notable BearersIn modern times, the name is borne by individuals across various fields:Radu Albot (born 1989), Moldovan tennis playerRadu Beligan (1918–2016), Romanian actor and directorRadu Bălescu (1932–2006), Romanian and Belgian physicistRadu Mihăileanu (born 1958), Romanian-French film directorRadu Lupu (born 1945), renowned Romanian pianistRelated NamesRadu has several cognates in other Slavic and neighboring languages, including Radko (Czech, Bulgarian), Rayko (Bulgarian), Rayno (Bulgarian), Ratko (Serbian), Radek (Czech), and Radim (Czech).Meaning: 'happy, willing' (from Slavic radŭ)Origin: Old Church Slavonic; entered Romanian via Slavic influenceType: First nameUsage Regions: Romania, Moldova, diaspora communities