R. S. P. Beekes has suggested a pre-Greek origin and a connection with the root of the word (σοφός, "wise").R. S. P. Beekes, Etymological Dictionary of Greek, Brill, 2009, p. xxxiii. German mythographer Otto Gruppe thought that the name derived from (σίσυς, "a goat's skin"), in reference to a rain-charm in which goats' skins were used.Gruppe, O. Griechische Mythologie (1906), ii., p. 1021
