Wikipedia
Hervor
Hervor is the name of two female characters in the cycle of the magic sword Tyrfing, presented in Hervarar saga with parts found in the Poetic Edda. One, the viking Hervör, challenged her father Angantýr's ghost in his gravemound for his cursed sword Tyrfing, and bore Heithrek, father of the other Hervör, a commander killed in battle with her brother. The two are thought by some academics to be the same character, duplicated.
Additionally, Hervor is the name of a valkyrie married by Völund in the Poetic Edda poem Völundarkviða, see Hervör alvitr.