Cobthach
From BiblePortal Wikipedia
Cobthach [1]
an early Irish Christian, the son of Brendan, and brother of St. Baithen, St. Columba's successor at Iona, is mentioned among the companions of.St. Columba in crossing from Ireland, to Iona. Camerarius, without authority, places him in the calendar on August 7. — Smith, Dict. of Christ. Biog. s.v.