Texts referring to Ra simply as "God" and "the Lord" are found as early as the Old Kingdom. The new cult of Amen (proto-YHWH) didn't entirely redirect that devotion.
Other gods could also be addressed as "Lord". Collectively the gods were called the "Baals", that is, the Lords. The Egyptian god Set was the leading "Baal" in many districts. We have discovered many allusions to and elements of the so-called pagan gods and even goddesses in Biblical descriptions of Jehovah, and I'm sure there must be much more yet to be discerned.
© Charles N. Pope, US Library of Congress. All rights reserved.