Medina Origin

Hello Nuestros Ranchos members, I have a general question. I want to know where the Medina family comes from. I have noticed, after researching my Medina family, that in Zacatecas there is a very high population of people with that last name. I have gone through several records for Rio Grande Zacatecas where my family is from and other locations and after spending a small amount of time flipping through the records I found a high volume of people with that last name.