And Pharaoh said, Who is the Lord? Rather, "Who is Jehovah?" Either Pharaoh is actually ignorant, or he pretends to be. The former is possible, since Jehovah was a name but little employed, until the return of Moses to Egypt.
The latter, however, is more probable. That I should obey his voice. Why am I to obey his voice? What is your Jehovah to me? What authority has he over me? He is, at best, your god, not mine. I know not Jehovah.
I acknowledge him not. He is not within the range of my Pantheon. Neither will I let Israel go, i.e. "nor even, if he were, would I consent to such a request as this from him." The Pharaohs assumed to be themselves gods, on a par with the national gods, and not bound to obey them.