Ecbasus was the father of Agenor, himself the father of Argus Panoptes (the giant who guarded Io). According to the historian Charax, Ecbasus fathered Arestor, whose son, Pelasgus, settled in the region of Arcadia (which was originally known as Pelasgia).
Notes
↑The name is a compound of two classic Greek word elements — Ek- (ἐκ), a prefix meaning "out of" or "from" and Basos (-βασος), derived from the verb bainō (βαίνω), meaning "to step," "to walk," or "to go."
Stephanus of Byzantium, Stephani Byzantii Ethnicorum quae supersunt, edited by August Meineike (1790-1870), published 1849. A few entries from this important ancient handbook of place names have been translated by Brady Kiesling. Online version at the Topos Text Project.