Magnolia is cute, but they seem to be going with PNW names. Cascade being the WORST. LOL!
Since it's a boy, I'll add these:
Cannon (for Cannon Beach)
Jackson (for Jacksonville, where I think they got married) - a little too trendy, but Corbin did mention Jack in the list they made
Ashe or Ashland (where Kelsey went to college and they lived there)
Lincoln (for Lincoln City, where they lived while preg w/ June)
I will be shook-shocked if they haven't already peeked and it turns out to be a girl.