K.C.
I really like the name Andrew and it was near the top of my list for my son. I also like the nickname Andy. Problem is, my husband and I don't like the nickname Drew, so we were hesitant to go with that one. But I still love it. It's also not very common right now, so he probably won't have other Andrew's at school. There are lots of Ben/Benjamin's right now.
My son is Josh and I am still really happy we picked it. I think it works with Nick and A., too.
Matt/Matthew
Mark
Ryan (but I only like it as a boy's name)
Brian
Sarah
Katie
Megan