Some genealogies show him marrying Sancha Rodriguez de LARA, dau Rodrigo Rodriguez de LARA and Garcia (male name) de AZAGA, which Rodrigo was the son of Rodrigo Gonzales de LARA and Sancha de CASTILE. She was dau King Alfonso VI of Castile, by Zaida. According to Nat Taylor, the wife of Gonzalo Ruiz Giron wasn't a Lara. The only descendants of Isabel/Zaida past the fourth generation are through the descendants of the Sicilian marriage of Elvira Alfonso.
"Rodrigo Rodriguez de Lara" is a genealogical fiction, invented by Salazar y Castro to link Sancha Rodriguez, who he wrongly thought to be a Lara, with Rodrigo Gonzalez. (Earlier reconstructions made Sancha daughter of Rodrigo Gonzalez, but chronology demanded an additional generation.) In fact, Rodrigo Gonzalez and Sancha Alfonso had two children, a son who entered the church, and a daughter married to the Count of Urgel, as his second wife. By her, the Count of Urgel had a son who died without issue, and a daughter married, as second wife, to the Count of Haro. By her, the Count of Haro had one known son, who in turn had one known son, at which point the line fades into the minor nobility. There are no known descendants of Sancha beyond this point. -- Todd Farmerie