In each and every age, in each stage of His work, God's name has carried weight. God's name hasn't rung empty. His every name reflects an age.
Jehovah, Jesus, and the Messiah all represent the Spirit of God. Yet these names just represent the ages in God's management, but not His entirety. The names people on earth call God can't express His entire disposition, can't express all that He is. They are just God's names in different ages. And so, when the final age— the age of the last days—arrives, God's name will change once more. He won't be called Jehovah nor Jesus, much less the Messiah. He will be called the powerful and almighty God. And with this name He will end the age.