What Does Josiah Mean?

Josiah means healed by Jehovah, or Jehovah will support
Became King of Judah at the age of 8, (2KINGS 23:25). He "did that which was right in the sight of the Lord, and walked in all the way of David his father

Josiah, I believe is a derivitive of the word Hosaih or one who is praised, like a gift from heaven.  Joshua a version of it represent peace, all good things.  There is a person on this site, that will give you whole history, extremely long but accurate, in the meantime, I hope this helps