I would say you're probably right. With surnames as the set and first names as individual elements, the elements can be shared much more often while the set nee

I would say you're probably right. With surnames as the set and first names as individual elements, the elements can be shared much more often while the set needs to be a unique identifier. There's only one United States of America and one Illinois, but there's a Springfield and Riverside in nearly every state and they all have a Main Street. Also, people gravitate towards naming their children after people (or just names) they like, whereas very few change their surname.