According to Buddhaghosa (AA.ii.511), VisÄkha’s mother was a brahmin called PañcÄlÄ«; but the TheragÄthÄ Commentary says (ThigA.i.331f) that VisÄkha’s mother was the daughter of the rÄjÄ of PañcÄla.
Dictionary of PÄli Proper Names • G.P. Malalasekera