Albert Barnes Commentary 2 Samuel 3:7

"Now Saul had a concubine, whose name was Rizpah, the daughter of Aiah: and [Ish-bosheth] said to Abner, Wherefore hast thou gone in unto my father`s concubine?" — 2 Samuel 3:7 (ASV)

Rizpah, the daughter of Aiah. The name Aiah was an Edomite, or rather Horite, name (Genesis 36:24).