More good stuff from Ken Harris in the ESV Study Bible. God aligns himself with the weak and powerless Hebrew slaves, when he tells Moses what to say to Pharaoh.

To someone as powerful as the king of Egypt, Moses making a request in the name of the Lord, the God of the Hebrews would look ridiculous. What god would choose to be identified with a nation of slaves and then also presume to make a request from the king of the nation that has enslaved them? Given all the other equally true things that God could have told Moses to say to designate him (e.g., the Lord, the God who has created the heavens and the earth), he is evidently making the point to both Egypt and Israel that he has chosen to identify with the people of his covenant even when they appear to have little value in the eyes of the nation they serve except as forced labor.