Thoughts on Killian?

My little guy was born a couple weeks ago and we named him Killian Dean. Killian is a special name to me because it was my grandfather's name and we kept the name a secret until Killy was earthside. My husband's family hates the name, and his grandma has twice now made the sign of the cross and prayed over the baby. She is convinced that the name is 'devilish' and will send him to hell 🙄. I'm not religious, so it doesn't bother me and I know she's being ridiculous but it concerns my husband. He's starting to believe this nonsense. We're obviously not going to change his name but I was wondering what other people though about the name Killian?