Hispanic middle name that goes with...

My husband and I have had a terrible time this pregnancy finding a name for our boy. It has been literally awful. We have finally agreed on the name Callan. Rhymes with Allen. We have 2 weeks left til he’s born.

My husband is half Mexican. It is important to my MIL to have some form of Spanish name in his name, and it’s important to me to have something meaningful for his name, which a Spanish name would be meaningful. So I need ideas on Spanish middle names that would flow well with Callan. Please throw around some nice ideas!

I’m also going to be posting a poll for spelling of Callan.