Longer names for Mack?

My husband and I like the name Mack. We literally can't agree on anything else. His great uncle is named Mack, and he is an amazing man and we adore him. I love the name, but his middle name will be Wayne (family middle name), and I think Mack Wayne sounds weird. Any suggestions?

The only one I can come up with is Mackson.

Also, what do you guys think about Mackston? If our daughter had been a boy she would have been Maxton (and called Max)...but now I am hooked on Mack.