middle names that go with Ben and Gwen ?

Hello I need some middle names I'm lost.  

If it's a boy his name will be Ben last name muriel (pronounced MUH-RELL) 

Ben Muriel 

If it's a girl her name will be Gwen last name muriel (pronounced MUH-RELL) 

Gwen Muriel 

What middle names go lol? 

Ben & Gwen aren't really the names but It rhymes with the names I picked out i have a name in mind not sure how it will flow or if I even like it but I don't have time to hear "I don't really like this name" etc lol

I'm just asking for middle names to see what I like or if I even want to name the baby that.

thank you! Lol