The biblical Josiah became king of Judah at age eight, ordered the temple repaired, and rediscovered a lost scroll of the law. He died young, in battle, around 609 BCE. Today he is the No. 53 boy in America, which puts him a few places ahead of every other Old Testament name except Elijah, Ezra, and Levi.
Hebrew origin, Reformed Christian revival
Josiah comes from the Hebrew Yoshiyahu (יֹאשִׁיָּהוּ), meaning Yahweh supports or healed by Yahweh, depending on which root scholars favour. The biblical king is the central reference point: 2 Kings 22-23 describes his reforms in detail, and his early death gave the name a heroic-young-leader register that older biblical names like Abraham or Isaac do not carry.
The American revival of Josiah began in the 1970s with the same evangelical and Reformed Christian naming wave that lifted Caleb, Elijah, and Isaiah. Within that cluster, Josiah occupied a slightly more distinctive register because the king's biography was less commonly known than Elijah's or Isaiah's prophetic stories. Parents who knew their Old Testament well chose Josiah; parents who were reaching for biblical-sounding names in general usually landed on Elijah first.
The 2017 peak and the slow plateau
Josiah's all-time peak came in 2017 at No. 50, and it has barely moved since — currently No. 53. That kind of stability after a peak is unusual and suggests the name has converted from a trend name into a household-vocabulary classic, the way Daniel did between 1990 and 2010. Eight years of essentially flat ranking is the signature of a name that has found its level.
Counter-reading: some commentators argue that the broader biblical-revival trend has run its course and that names like Josiah will fade as Gen Z parents pull away from explicitly religious choices. The data does not yet support that read. Josiah's 2024 birth count is virtually identical to its 2017 count, and the names ranked alongside it are still climbing rather than falling. The category is rotating, not collapsing.
Spelling, pronunciation, and the Joey question
Josiah is pronounced jo-SY-ah, with three syllables and the stress on the middle. The Y spelling sometimes gets confused with Hosea or Isaiah by people unfamiliar with the king, but the name has been in continuous American usage long enough that most teachers, doctors, and coffee baristas will read it correctly.
Nicknames vary by family. Joey is the most common short form historically, but contemporary parents often skip the nickname entirely or use Si or Siah informally. Sibling pairings work well with other multi-syllable Old Testament names: Josiah and Naomi, Josiah and Ezra, Josiah and Hannah. Middle-name combinations tend toward shorter, classic options: Josiah James, Josiah John, Josiah Daniel. The full biblical names category remains one of the strongest cohorts in modern American boy naming.