See, I assumed that as well.
I work at a school with a 90%+ Latino population, so I searched my school's database and we have zero Kimberlys in our 800 students - even the middle and high schools we feed into (over 5000 students between them) have only 6 Kimberlys between them. Maybe it's being used mostly by Mexican immigrants, as opposed to the Puerto Rican and Cuban population of Florida?