The name Tylos is thought to be a Hellenisation of the Semitic ''Tilmun'' (from Dilmun). The term Tylos was commonly used for the islands until Ptolemy's ''Geographia'' when the inhabitants are referred to as Thilouanoi. Some place names in Bahrain go back to the Tylos era; for instance the name of Arad, a residential suburb of Muharraq, is believed to originate from "Arados", the ancient Greek name for Muharraq.