The name Sasyn is an ancient personal name that is formed from the German ethnonym "Sax" (Saxon) by adding the Slavic suffix -in. In this form, the name has been known among Serbs since the 14th century. Sasyn is also mentioned in Belarus from the 15th to the 18th century. Researcher M. Birilo believes that this name may be related to the Christian name Sasoniy.