A spelling variant of Josiah, meaning Yahweh supports or heals.
Josiyah is a variant spelling of Josiah, one of the Hebrew Bible's most celebrated royal names — יֹאשִׁיָּהוּ (Yoshiyahu) — meaning "the Lord supports," "the Lord heals," or "God's fire." The name belongs to Josiah, King of Judah (reigned c. 640–609 BCE), who ascended to the throne as a child and became one of the most reforming monarchs in Israelite history.
Under his reign, the Book of the Law was rediscovered in the Temple, sparking a religious revolution: the purging of idol worship, the renewal of the Passover covenant, and a centralizing of worship at Jerusalem that biblical historians consider a watershed moment in the development of monotheistic religion. Josiah's reputation for righteousness made his name a touchstone in Puritan New England, where biblical names were chosen as deliberate declarations of faith and moral aspiration. Josiah Bartlett, a signer of the Declaration of Independence, and Josiah Wedgwood, the pottery magnate and abolitionist who was Charles Darwin's grandfather, represent the name's 18th-century prestige on both sides of the Atlantic.
In African American naming tradition, Josiah carried particular power as a name associated with dignity and divine favor. The Josiyah spelling — substituting a Y for the A — is a modern orthographic variation that adds visual individuality while preserving the name's sound and legacy entirely intact. It sits within a broader contemporary trend of softening or distinguishing classical biblical names through creative spelling, giving the child a name that is simultaneously ancient and unmistakably theirs.