The Arredondo name originated in the town of Arredondo in the northern part of Spain in what is now Cantabria but used to be a part of Old Castille, the town of Arredondo is South East of Santander Spain. While the Arredondo name is relatively rare in Spain it is one of the 1000 most popular Hispanic names in the U.S. and Mexico. The Arredondo's came to the new world and were quite fruitful. For those of you looking for Arredondo ancestors in Northern Mexico or the Southern U.S., Ancestry.com has Mexican Parish records that have all of the birth and death records for the major towns of Northern Mexico from the mid 1700s through the late 1800s. I have seen records for a Sixto Arredondo on Ancestry.com either in the Mexican parish records of the Texas Census records. For those of you who like me want to trace your roots all the way back to Spain, The Enciclopedia Heraldica y Genealogica y Diccionario de Appellidos by Garcia Caraffa is a very good place to start he traces the Arredondos from Spain to Mexico, Cuba the Dominican Republic and elsewhere in Hispanola. I was able to trace my mother's family line back to about the 1500s in Spain! You can find the book in various University Libraries, through the Library of Congress and through the Mormon Family History Libraries (which are mainly used by non-Mormons like me). Happy trails.