Baby middle name!

We're trying to come up with a middle name for our first son. His name will definitely be Atticus but we can't figure out a middle name.

Here are our thoughts:

Atticus Ryan (husband's name is Ryan)

Atticus John (Father in law is Douglas John)

Atticus Knox (my favorite)

Any other suggestions? I want something unique but still meaningful. Only Knox is unique but all have sentimental value.