Canon O'Hanlon notes the entry of the name Conan in the Martyrology of Donegal at August 16. Without any further specifics this saint cannot be identified:
St. Conan.
St. Conan.
At the 16th of August, the name Conan, without any further designation, is found entered in the Martyrology of Donegal. His position in the Church, and his place, are not known.