Since my sister passed away, we changed our girl's name slightly to Emilynne Jennifer (my sister is Jennifer) and our boy's name is Christian Jacob.
I hear you about a sibling losing individuality. We tend to have some friends and family who think the boys are one kid - ie, they get one Christmas or birthday gift to share. It kills me because we don't do that to anyone else's kids. Two kids, one gift each... Just because they share a birthday, doesn't mean they should share everything, you know? I dunno, I hope it doesn't sound selfish.