köken: Etymology tree Proto-Indo-European *sem- Proto-Indo-European *somHós Proto-Slavic *samъ Old Polish sam Polish sam Proto-Slavic *-o- Old Polish -o- Polish -o- Polish samo- Proto-Indo-European *bʰegʷ- Proto-Slavic *bě̑gъ Old Polish bieg Polish bieg Proto-Indo-European *-nós Proto-Balto-Slavic *-inas Proto-Slavic *-ьnъ Old Polish -ny Polish -ny Polish samobieżny From samo- + bieg + -ny.