Exodus 3:13

What is his name - The meaning of this question is evidently: “By which name shall I tell them that the promise is confirmed?” Each name of the Deity represented some aspect or manifestation of His attributes (compare the introduction to Genesis). What Moses needed was not a new name, but direction to use that name which would bear in itself a pledge of accomplishment. Moses was familiar with the Egyptian habit of choosing from the names of the gods that which bore specially upon the wants and circumstances of their worshippers, and this may have suggested the question which would be the first his own people would expect him to answer.