Народная этимология
Folk etymology derives the island's name from Tugor-khan, who won a victory over Kyiv and whose daughter married Prince Sviatopolk II of Kyiv. The summer residence of his daughter and her husband was allegedly named in honor of Tugor-khan, although in truth his name is mentioned but once in Slavonic chronicles. In 1534 the island came under control of the Pustynno-Mykilsky monastery, and was later returned to the city in 1698.