My research has indicated that the Yrigollen(Irigollen, Irogyen, Yrigoyen) came from Parras, Coahuila. My ancestor married in Monterrey, NL and her children seemed to go to Nava, Coahuila in the early 1800s. However she was actually born in Parras of a Basque father and a Tlaxcalan mother. The Yrigollens seemed to have something to do with Francisco Urdinola, who was also Basque.