My name is Beverly, and people tend to assume that my middle name must be either Anne or Marie -- don't know why. Even my former therapist, when I'd say something outrageous, would respond with "Beverly Marie!" Uh, no ... it's Louise.
I did know a family of 14 children, nine of whom were girls who all had the middle name Marie. Mom was a devout Catholic. I also knew a large French Canadian family (also devout Catholics) where all the girls had the first name Marie and all the boys had the first name Joseph -- they went by their middle names.