Boy names that sound good with Mason

We have decided we'd love to use the name Mason for our son who's due in July, but we're having a hard time deciding on a second name, be it first or middle, we don't really care which goes where. Mason as a first or middle is fine with us, but we're looking for some cool middle names, or a nice first name that goes with Mason Shepherd.

We have a Gavin Wilde, and love his middle name, so my fiance is struggling with finding something as cool as Wilde, without being too wild!