Well the Amen is Jesus. All of those titles at the start of 3:14 are names He is called. Just some of His many titles throughout the Bible. I have a framed poster in my guest bedroom that says, “And He Shall Be Called” and lists His many Names. Of course, “Amen” is one of them.
Just a little something for my guests to ponder. :^)
Malachi 4:2
But unto you that fear my name shall the Sun of righteousness arise with healing in his wings; and ye shall go forth, and grow up as calves of the stall.