This name was used by the Irish, or more properly Scottish, Morgan, as a translation of his own name, and thus became tainted with the connection of the Pelagian heresy. (Yonge)

Augustinus, de peccato originali, § 13, calls Cœlestius apertior, Pelagius occultior.  Whether the account given by Prædestinatus is correct, that Cœlestius had also written a work against the doctrine of the traduction of souls, before Pelagius appeared openly as a polemic, is questionable. (Torrey)