The name given here is a state of being, not a title in the sky. Called the God of Abraham, of Isaac, of Jacob, it is the same awareness passing through one life after another, the felt sense of "I am" that every person carries. That awareness is what sends and what saves. It wore each of those names in turn and remains the constant beneath all of them.
This name is called a memorial to all generations because it never changes hands. The same power that formed the fathers is the power alive in the reader now, under his own conviction of being. Whatever a man joins to that inner "I am," holding it as settled, is what he becomes. The name is his own sense of existence, and it is eternal.