Dorca was the daughter of Ramon I Bonfill de Castellvell but her mother is unknown. The date and place of her birth have not been found.
Dorca de Castellvell
Ramon I Bonfill de Castellvell (c1045-c1075)
Guillaume I de Castellvell
Unifred Amat d'Arles (-1011)
Riquilda de Saint-Martin