🔼The name Jareb in the Bible
The name Jareb is probably not a personal name but an epithet for an Assyrian king, perhaps not unlike the Philistine epithet Abimelech. It occurs only in the book of Hosea (Hosea 5:13 and 10:6), both times in the compound "king Jareb". It is assumed that this epithet "King Jareb" covers kings Pul, Tiglath-pileser III and Shalmaneser V.
🔼Etymology of the name Jareb
According to the consulted sources, the name Jareb comes from the root-verb ריב (rib), meaning to contend:
The name Jareb could be regarded as constructed from the root rib pre-fixed with the letter yod, which makes it active: he will rib. However, this name omits the central yod. This might be acceptable because the yod serves here as a vowel, but perhaps the yod wasn't omitted and this name comes in stead from the root cluster רבב ־ רבה:
None of the consulted sources proposes a possible relation between the name Jareb and the verbs רבב and רבה, but it takes no great leap to read a meaning of He Will Increase into this name.
For a meaning of the name Jareb, NOBSE Study Bible Name List reads He Will Contend. Alfred Jones (Dictionary of Old Testament Proper Names) torts and twists until he's grafted the meaning of to argue and thus to plead onto this verb, and reads a rather forced He Will Plead. BDB Theological Dictionary proposes Let Him Contend or One Who Contends.