[jadar]

The Hebrew word used is Elohim. While the book ever explicitly uses the word, it stands to reason the author is speaking of YHWH, historically rendered as Jehovah or Yahweh. And as Jesus is the Son, the second person of the Trinity, it refers to him as well. The book is written by Solomon, the son of David, the king of Israel, and hence it comes smack dab in the middle of the covenant history of Israel. Solomon describes Elohim with attributes of Jehovah throughout the book. He is the creator, sustainer, law-giver, etc. Not to mention the many times in the rest of the Scriptures that use Elohim to refer to Jehovah. Finally, the closing verses invoke the covenantal language of Israel being bound to Jehovah’s law, “Fear God and keep his commandments” would remind the original readers of Deuteronomy 6:2 or 10:12, which clearly do invoke Jehovah.

[weregiraffe]

Did you know that Elohim and Yahweh originally come from different polytheistic pantheons?

[NoGravitas]

No, they were from the same pantheon. Yahweh was originally a second-tier deity in it, a son of El, and one of the tribal deities that El granted dominion over each their particular tribe. Over time, that tribe elevated Yahweh to senior deity and merged his attributes with those of El, eventually demonizing all the other gods of the pantheon.