Sue, not to throw too much of a spanner in the works, so to speak, but as you have said that you are only guessing that he was born in Ireland and that his father worker as a ship builder do not keep your research soley to Ireland. I have a great uncle who was born in Glasgow and married an O'Hare in that city. I have yet to do the research on this part of my family but I have it that she or her parents may have originated from Ireland (family tales and as yet not proven), being that the area of Glasow that my great uncle came from drew a lot of its workforce from Ireland to work in the ship yards there, it may be another avenue that you might want to explore but with little to go on it will be very hard for you.
OR