I need a middle name! Help!

Kayla • Married & we had our perfect baby boy on 03/21/2015, Pierce Huntlee. He was 7lbs 10oz, & 19.5 in 💙
So we have our girl name picked out, first and middle. But we are having trouble picking our boys middle name. His first name will be Pierce. Our last name is Roberson. 
​Pierce _______ Roberson?? 
​Thanks in advance! ❤️