Name game!

So, we don't know what we're having yet but would like to have names set when we announce about baby. We are set on a girl name and for a boy name we're pretty set on Mason but can't think of a good middle name. Can't be James because our sons middle name is already James. We were thinking Ryan because that's my fiancé's middle name, but his initials would be MRS so we don't know if we're set on it. Any suggestions??!