In Greek the —id or —ides ending denotes “descended from,” indicating the paternal line. So the offspring of the sea god NEREUS are NEREIDS, of Oceanus OCEANIDS, of Heracles the Heraclides, and so on. Thetis’s mother was an Oceanid whose name, although a perfectly good Greek name for a girl, will usually cause the modern reader to smile—Doris.
