Wasn't
Dougal the name of one of
Newt's animals in Fantastic Beasts? Anyways, I kinda like it. I wouldn't use it on a baby nowadays, but I definitely would use it on pet.
Oisín seems too weird, I don't really like it.
I love both
Niamh and
Neve, but maybe
Niamh would carry some misspronunciation.
I hate
Clíodhna, but
Clío has a nice ring (I prefer this spelling and the
Clio one over
Cleo)