A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Author: Leora Oldessroth
Voniel, daughter of Ella, daughter of Soong, is an Ogier woman married to Elder Haman and is the sister of Covril; she tells Elder Haman that he must go find Loial and bring him back to the stedding. (LoC, Ch. 20)