I have always wanted to go to Ireland, but the thing I've got against Irish names is that I can never figure out how to pronounce them. Lol. Like the actress Saoirse Ronan? I had always thought it was "Say-ORSE." Then I discovered that it's "SEER-sha." WTF, in my opinion. As to whether or not Eanna is too Irish.... Well, I just looked it up, and I guess the pronunciation isn't too left-of-center, so no. I think I sort of like it. It's pretty.
As for sibsets:
Telfalathiel posted a message a few days ago asking for opinions on Scarlet and Jasper as a sibset; I think that's adorable.
I always thought that if I ever had a girl, I'd name her Adeline or Adelaide, and the boy would be Felix. I don't know if these names even sound really good together; they aren't even my favorite names. I just thought they were interesting, but not too weird. :)