Osiah is a modern American name that is usually understood as a spelling of Hosea, the Hebrew prophet's name meaning "salvation", or as a blend of Josiah and Isaiah with the first letter dropped. It has no record before this century and joins the many Bible-flavored -iah names that American parents created in the 2010s. Osiah climbed from number 7895 in 2015 to number 2508 in 2025, its best rank so far, with 54 boys given the name.