There's a Gage family that have connections with The Manor House, Rathlin Island. A daughter of an Earl of Caledon married a Gage. Am I going along the right lines or is the family you're researching further down the social scale? www.caledon.org.uk/earls_background.php
Samuel Lewis' 1837 Topographical Dictionary of Ireland mentions that Fyfinn Lodge in Urney Parish was the seat of Conolly Gage. www.trainweb.org/i3/lewis_tyr.htm