The following "gods" are specifically named in the Old Testament
1. Dagon 1 Samuel 05:02 etc Philistine/Ekronian/Babylonian god of agriculture
2. Milcom 1 Kings 11:05 Ammonite god
3. Ashtoreth 1 Kings 11:05 etc Canaanite goddess
4. Chemosh 1 Kings 11:07 etc Moabite war god
5. Molech 1 Kings 11:07 Ammonite God, also called Moloch, most probably Baal-Hammon of Carthage
6. Rimmon 2 Kings 05:18 Babylonian/Syrian storm god involved (as Ramman) with the Deluge; also known as Ramman/Rammon
7. Ashima 2 Kings 17:30 Samaritan Moon goddess
8. Nergal 2 Kings 17:30 Cuth/Assyrian/Babylonian war and underworld god, also called Meshlamthea
9. Succoth-Benoth 2 Kings 17:30 Babylonian fertility goddess ("She Who Produces Seed"), also known as Zarpanitu/Zerpanitum
10. Adrammelech & Anammelech 2 Kings 17:31 Sepharvite gods
11. Nibhaz & Tartak 2 Kings 17:31 Avite gods
12. Nisroch 2 Kings 19:37 Assyrian god
13. Baal/Baalim 1 Kings 18:18, 19 etc Canaanite god[s] ("lord[s]") of fertility, vegetation and storms, pl. a collective of the different aspects of Baal. (Baal-berith, Judges 8:33 A regional variation/aspect of Baal)
14. Bel & Nebo Isaiah 46:01 Assyrian/Babylonian/Sumerian/Syrian gods. Bel = “lord”. Nebo was a god of wisdom and writing, also called Nabu
15. Tammuz Ezekial 8:14 Assyrian/Babylonian God