Josiah \j(o)-siah\ as a boy's name is pronounced jo-SYE-ah. It is of Hebrew origin, and the meaning of Josiah is "Jehovah helps". Biblical: king of Judah at age eight after his father was assassinated, Josiah ruled well for 31 years. Porcelain entrepreneur Josiah Wedgwood.

Josiah has 3 variant forms: Josia, Josias and Joziah.

For more information, see also the related name Moses.

Baby names that sound like Josiah are Jesiah, Isiah, Josua, Joshuah and Josh.