Guillaume was the son of Jean du Perrier and Constance Gaudin. The date and place of his birth have not been found.
Guillaume du Perrier
Jean du Perrier (c1360-?)
Alain Geoffroy du Perrier
Plaisou de Quintin (c1360-?)
Geoffroy IV de Quintin (c1327-<1387)
Robine de Quebriac
Constance Gaudin (c1400-?)