Eoghan ua Cathain (died 980) was Abbot of Clonfert.
There is a gap of sixty-six years between recorded abbots, rendering the exact succession between Aedh and Eoghan uncertain.
References
Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork Annals of Tigernach at CELT: Corpus of Electronic Texts at University College Cork Revised edition of McCarthy's synchronisms at Trinity College Dublin. MacLysaght, Edward, The Surnames of Ireland, 1978 Byrne, Francis John (2001), Irish Kings and High-Kings, Dublin: Four Courts Press,