A little help with a name, please :)

I'm working on this new story of mine and I'm having problems with the names.

There's these two siblings a boy and a girl, their last name is McCoy. Their have an older sister named Emma, mom and dad are Jimmy and Claire.

I have two choices for the boy, Noah or Aaron. His middle name is Michael.

The choices for the girl is either Lily or Beth. Her middle name is Rose.

So what do you guys think Noah or Aaron or Lily or Beth.

Beth is after the Kiss song, and there's several moments where I was planning on having someone sing the song, to her. But I just can't decide.