a Roman cognomen, was originally a praenomen, like Postumus and Agrippa. The Roman grammarians connected it with procul, and explain it in two different ways, as meaning either a person born when his father was at a distance from his native country, or a person born of parents advanced in age. (Paul. Diac. ex Fest. p. 225, ed. Millerr)
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890