Rizpah - See the marginal reference. A foreign origin was possibly the cause of the selection of Rizpah’s sons as victims.
Sons of Michal - An obvious error for “Merab” (1 Samuel 18:19 note).
Related Commentaries of 2 Samuel 21:8
2 Samuel 21:8
8 But the king took the two sons of Rizpah the daughter of Aiah, whom she bare unto Saul, Armoni and Mephibosheth; and the five sons of Michalc the daughter of Saul, whom she brought up for Adriel the son of Barzillai the Meholathite: