Albert Barnes Commentary 2 Kings 11:4

"And in the seventh year Jehoiada sent and fetched the captains over hundreds of the Carites and of the guard, and brought them to him into the house of Jehovah; and he made a covenant with them, and took an oath of them in the house of Jehovah, and showed them the king`s son." — 2 Kings 11:4 (ASV)

See the marginal reference.

The captains - The word used here and in 2 Kings 11:19, הא־כרי ha-kârı̂y, designates a certain part of the royal guard, probably the part known in earlier times as the Cherethites (1 Kings 1:38). Others see in the term an ethnic name—“Carians,” who seem to have been very inclined to serve as mercenaries from an early date. The entire passage can be rendered this way: And in the seventh year Jehoiada sent and fetched the centurions of the Carians and the guardsmen (literally, “runners,” 2 Kings 10:25), and so on.