Izaiah

Izaiah is a modern spelling of Isaiah, a Hebrew biblical name meaning Yahweh is salvation. The z changes the written form while making a consonant sound explicit that many English speakers already use in Isaiah. The connection with the biblical prophet belongs to the older name, not to a separate meaning created by the new spelling.

Isaiah is the closest comparison when preserving a traditional biblical form matters. Izaiah may instead match a relative's spelling or a family's preferred way of representing the sound. The vowel sequence can invite different readings, so the intended pronunciation is worth introducing alongside the name rather than assuming every reader will divide it identically.