Melody,
Georgina and
Aoife would be terrific together. The Mc at the beginning of the surname puts them all under the same Gaelic umbrella. And
Georgina has always sounded very Irish to me for some reason. I don't mean in origin, but it seems it would be very popular there.
Georgina and
Caroline both. I don't know why. Irish melodies are lovely. So the three (
Melody,
Georgina and
Aoife) absolutely blend nicely in my mind.
Then again, I'm an
Aoife fanatic, so caveat emptor. :-)