Gjurd was the son of Nils Oxenstierna and Ingegerd Karlsdotter Folkungaätten. The date and place of his birth have not been found.
His wife was Katrin Petersdotter. They were married, but the date and place have not been found. Their two known children were Torsten Gjurdsson (?-<1399) and Ragnhild Gjurdsdotter (?-c1357).