I don't think they decided to go for a "realistic" when they made the movie The Mummy.
Imhotep was an architect, supposed to have designed the first pyramids (so much before tutankhamun), he was later made into a god and became patron of artisans and science/mathematic like you said.
anaksunamun sounds nice and original, altough ankhsunamun sounds cool too. Ankh is a cool symbol.