Pegasus

From Late Middle English Pegase, Pegasus, from Latin Pēgasus, from Ancient Greek Πήγασος (Pḗgasos), traditionally associated with πηγή (pēgḗ, “spring, fountain, fountain fed by a spring”), especially used to denote springs of Ocean, where Perseus killed Medusa, from whose blood Pegasus sprang. Some have dismissed this as folk etymology and suggest a pre-Greek origin because of the -ασος suffix. First attested in the 14th century.