70%RatingSave Gender Feminine Usage Greek Mythology Scripts Θέτις(Ancient Greek) Meaning & History Possibly derived from Greek θέτης (thetes) meaning "one who places", a derivative of τίθημι (tithemi) meaning "to set, to place". This was the name of one of the Nereids in Greek mythology. With Peleus she was the mother of Achilles. Categories actions, asteroids, creation, Greek mythology, mothers, Nereids, Ni no Kuni characters, nymphs