Pandion was a son of Erichthonius and the Naiad Praxithea. He married his aunt Zeuxippe and she bore him Erechtheus and Butes as sons and Procne and Philomela as daughters. His name means 'all-divine', 'all-marvellous', from pan, 'all' and dios, 'godlike'.

Thomas Keightley poetically suggests that this could be a reference to the sun in the spring when the swallow and nightingale (Procne and Philomela) appear. Another Pandion was the son of Cecrops and Metiadusa. He was the great-grandson of the first Pandion mentioned here.