2 Samuel 8:18
18. Cherethites—that is, Philistines (Zep 2:5).
Pelethites—from Pelet (1Ch 12:3). They were the valiant men who, having accompanied David during his exile among the Philistines, were made his bodyguard.2 Samuel 20:23
23. Now Joab was over all the host of Israel—David, whatever his private wishes, found that he possessed not the power of removing Joab; so winking at the murder of Amasa, he re-established that officer in his former post of commander-in-chief. The enumeration of David's cabinet is here given to show that the government was re-established in its wonted course.
1 Chronicles 18:17
17. the Cherethites and the Pelethites—who formed the royal bodyguard. The Cherethites were, most probably, those brave men who all along accompanied David while among the Philistines, and from that people derived their name (1Sa 30:14; Eze 25:16; Zep 2:5) as well as their skill in archery—while the Pelethites were those who joined him at Ziklag, took their name from Pelet, the chief man in the company (1Ch 12:3), and, being Benjamites, were expert in the use of the sling.