I am really interested in this discussion since there are a group of us Guinanes/Guinan/Ginnane that have been in touch on this subject. What some are working on is the supposition that the Guinanes originally came from France or Spain in the 1600's to the area of Carrigaholt (Shannon River islands) and then spread to other counties from there.
I had always heard that my grandfather, John Guinane, came from County Clare but have not proven this because I am unable to find his parents, John Guinane and Mary Curry Guinane. Our name has always been spelled "Guinane" as far as I know. I have been going through the LDS films hoping to find the marriage information but have not found anything yet. I am now working on the Tulla film which goes back quite aways. Since I do not know where Mary Curry came from and since the marriage would probably have taken place in her church I might be "barking up the wrong tree"! I keep plugging away hoping that I might find something before I pass on :). What are your names in case I run across these I will pass the information to you.
Margaret Guinane Mason
Southern Tier New York State