I need middle name help.

Ok so hubby and I decided to name our son Killian... Long story short its my sexond chouce. My mil has bashed it non stop and my mom totally bashed my first choice until I just hated it. Now I need a middle name that works for Killian and with our last name which starts with a D. I have a daughter who is 10 months old named Freya Moon. I want my son to have a special and semi unique name like his sister does. I can't bring myself to use a name thats overly popular or conventional. My hubby keeps making it into a joke and I feel like he isnt taking it seriously. I mean he suggested using Cheech or Chong... 😒 Help!