Really serious about this name...?

I love Arielle as the girls name, I like Grace as the middle name. As for the boy, I as an adult love the name but you are right, kids can be cruel and I don't think it would be the best thing during your sons childhood. Maybe your grandfathers middle name or depending maybe even the last name. For example my friend is named Karter after his mothers maiden name and my cousin is Nelson after my grandfathers middle name. Good luck and congrats!