I have two last names, even tho my parents weren't legally married. I'd say go for it!
My daughter middle names are Sapphire Deziray and my son middle name will be Paul Anthony (after both of his deceased grandfather's)
I'm doing it too you're not crazy haha its been my plan forever to give my son two middle namesfor various reasons and I love it.
If you don't mind me asking what are the middle names. I'm going back and forth with giving my new baby two last names. We aren't married so i just want to use my last name but he's there and a good dad. So confused. What's your thoughts.