You have to give the Spanish credit for spreading their seed far and wide...even in places that they never conquered or held on to for very long. Years back when I first moved to Louisiana, I was kind of surprised at the number of Spanish surnames that have held on here from even before the arrival of the French Cajuns. Some of the family names include Ortego, Romero, Villareal, etc. although all are pronounced in very flat English, and not with the Spanish pronunciation and inflection you'd expect in more recent immigrant communities. Likewise, if you meet a native born Louisianian with the surname, "Rivers" there's a good chance that has been anglicized from "Rivera."
Oh, so that's where Jerry Rivers comes from! ;-)