Yahu is Hebrew for Jehu, the man that had Jezebel cast down which means 'Yah is He' or 'He is Yah' while Yah is the short form of the Hebrew name of God.
Ps 68:4 Sing unto God, sing praises to his name: extol him that rideth upon the heavens by his name JAH (Yah in Hebrew), and rejoice before him.
My calling is in battling Jezebel. In my 20s I had a conflict with the prime candidate to be the next worldwide high priestess of Asthoreth, the goddess of Jezebel. She, her coven and followers ended up in prison or dead as a result of that conflict.
I got called to play the role of Elijah to her Jezebel. The Hebrew for Elijah is also Eli-Yahu ('mighty in Yah is He').
Unfortunately I lost my wife as a result of that conflict.
So I chose a name that is based on my calling under the spirit and power of Elijah. But just like John the Baptist who had the same type of calling, Jezebel has been my constant nemesis although I did survive the conflict at least this long.