Form of YERUSLAN used by Aleksandr Pushkin in his poem 'Ruslan and Ludmila' (1820), which was loosely based on Russian and Tatar folktales of Yeruslan Lazarevich.
From Tatar Uruslan, which was possibly from Turkic arslan meaning "lion". Yeruslan Lazarevich is the name of a hero in Russian and Tatar folktales. These tales were based on (or at least influenced by) Persian tales of their hero Rostam.
