"c/f" means "compare with" - what I was saying was that "Mac Giolla Fionn" is very similar to "Mac Giolla Ruaidh", the origins of Gilroy, and that that is how I drew my conclusions about the meaning. I don't know anything about Gilpin, I've never heard of it.
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.