Thanks George: fascinating thread.

The Fergus of Carrickfergus is traditionally given as Fergus Mor, the founder, or perhaps the son of the founder, of the Scots/Irish Kingdom of Dalriada in the 6th C AD. Carrickfergus was originally Knockfergus (both prefixes mean approx the same "rock"). The Castle was built in 1180 by John de Courcy, tho there was an older settlement there. A 1540 map, printed in Bardon's Hist of Belfast, spells it as Kragfargus.

Coan is located 4 miles SE of Castlecomer. From the Irish - An Cuan ("recess"). Also there are two separate adjacent townlands bearing the name; 1. Coan East. 2. Coan West.