So. The Hebrew drops the embarrassing "k" of Sabako, his Ethiopian name. Afterward vanquished by Tir-hakah. See note on 2 Kings 19:9.
Related Commentaries of 2 Kings 17:4
2 Kings 17:4
4 And the king of Assyria found conspiracy in Hoshea: for he had sent messengers to So king of Egypt, and brought no presentb to the king of Assyria, as he had done year by year: therefore the king of Assyria shut him up, and bound him in prison.