Origen of name is considered Castille.. Some genealogists believe that name is derived from "Casa de Lara" Earliest writing mentioning this name is from 1163 AD where a King named Fernando " El Santo" writes to thank a Gonzalo Palaez de Herrera for his assistance in the taking of Seville from the Moors.. This name appears the same as has happened to the name of "Hernandez" and "Fernandez" where the "H" and "F" are interchanged when referring to the same person.. In ancient documents the name can be read as Ferrera or Herrera.. The site mentioned above also has discriptions of the various Coats of Arms associated with this Family.