Samodai is a Slavic personal name formed from the pronoun base "samo-" and a verbal base, similar to names like Bohdai, Samoderzh, and others. The earliest mentions of the name Samodai date back to the late Middle Ages and originate from the region of Kholm. For example, in 1434, documents mention "Iohannes episcopus Chelmiensis Samoday," and in 1431, "Petro dieto Samoday." In 1473, there is also a record associated with the name Samoderzh: "and among them were witnesses pan Tatomir Balitsky, pan Ivashko Hololeshevsky... Samoderzhko Lyakhovitsky." In Zakarpattia, surnames such as Samodai and similar structures like Samoriga and Samokhvat have been recorded since the late Middle Ages.