Baby names for triplets...!!!???

I'm due to have a boy and two girls in 10 weeks and am not sure what to name them. I thought about Ava, Lily and Aidan etc. but have gone off them now. I also thought of William but thats the name of the dad and i'm not keen on my son having a jr. at the end of his name. The only name I still like from my previous list is Rosie. I need help with names. They have 1 big sister called Amelia Piper and need names to go with that. Please help!!!!!! I like older names but am keen on more modern ones now. Am considering Ava at the moment but still not sure. I need a first name and 1/2 middle names to go with the surname Butler. Thanks x