Was not the problem the fact that they weren't using the parents' name, Boyle. They were obliged to register the daughter with their own surname: a piece of bureaucracy you may disagree with, but nothing to do with Gaelic. The father could have changed their own name to NicBhaoille or whatever he liked, and then called his daughter likewise. With the first names, there was no problem. You can use any language you like, or make names up from scratch.