Achea ST., of Kiliglais, near Ardagh, Ireland, was the daughter of St. Darerca, sister of St. Patrick, in the 5th century. She is commemorated Aug. 5. Her name is also written Echea and Echi. See O'Clery, Martyrol. Dungall. (ed Todd and Reeves); Colgan, Acta SS. Hiberniae, p. 718. — Smith, Dict. of Christ. Biog s.v.