Is this name combination too weird?

My wife and I have twin daughters named Samantha and Cassandra. After a 3 year IVF journey, my wife is pregnant and we just found out its a boy! We started to talk about names and she really wants to name him Dean.

I'm not a fan of Supernatural and have only seen the odd episode here or there whilst she's watching it, but I know she adores it, and it just ended last night. I watched the ending with her for moral support (there were many tears) and afterwards she told me how she's really attached to naming this baby Dean after one of the characters. And I'm just not sure.

I don't have any problem with the name itself, its just that the other two main characters of the show are Sam and Cas (both are nn we use for our girls) And, even though our daughters weren't named after the other characters, I know that if we name this baby Dean then anyone who knows the show will assume they're all named after the characters.

I just don't know if its too weird? Too on the nose? If you heard these names for siblings would you assume we were super crazy obsessed fans of the show?

Any opinions are helpful, I just don't really know how I feel about it.