According to one tale about the Bryndar, they were real human women who adopted animal forms to discourage anyone who ventured into their forest. A certain minstrel wrote a ballad about one of these women, whom he named "Snowhair the Sorceress". She was depicted as a scornful, white-haired mage.
Snowhair the Sorceress only appears in the ballad, and thus is assumed to be fictional. However, as the Bryndar are speculated to be real, it is possible that Snowhair the Sorceress is based on a real person.