"The Bonny Hind" is Child ballad number 50 (Roud 205).[1]
A squire persuades a maiden to lie with him. Afterward, she asks his name, and he reveals that he is a lord's son. She calls him a liar: she is that lord's daughter. The horror-struck son reveals that he was long at sea. She stabs herself to death, and he buries her. He goes home and grieves for a "bonny hind" whatever his father can do to distract him.
Other ballads on this theme include "Sheath and Knife", "The King's Dochter Lady Jean", and "Lizie Wan".[2]