Boyd’s Bible Dictionary:
(firm). (1) A king of Syria or Damascus (2 Kings 15:37; 16:5-9; Isa. 7:1-8; 8:6; 9:11). (2) His descendants returned (Ezra 2:48; Neh. 7:50).
Concise Bible Dictionary:
1. King of Syria, who, in alliance with Pekah king of Israel, made an attack upon Ahaz, king of Judah. Isaiah was sent to comfort Ahaz, but he asked the aid of Assyria, sending him silver and gold. Rezin was slain, Damascus made desolate, and the people carried into captivity (2 Kings 15:37; 2 Kings 16:5-9; Isa. 7:1-8; Isa. 8:6; Isa. 9:11).
2. Ancestor of some Nethinim who returned from exile (Ezra 2:48; Neh. 7:50).
Strong’s Dictionary of Hebrew Words:
Meaning:
probably for 7522; Retsin, the name of a Syrian and of an Israelite
Jackson’s Dictionary of Scripture Proper Names:
delightsomeness
Potts’ Bible Proper Names:
Firm; sure; affection; good―will; dominion:―name of a Syrian and of an Israelite, 2 Kings 15:37. {Firmus}