Ithan is likely a variant of Ethan, from Hebrew, meaning firm, strong, or enduring.
Ithan is most naturally read as a variant spelling of Ethan, one of the great Biblical names of the Hebrew tradition. The Hebrew Eitan (איתן) means "strong," "enduring," or "permanent" — a word used in the Hebrew Bible to describe rivers that flow without ceasing and character that does not bend. The name appears in the Old Testament as Ethan the Ezrahite, attributed with a wisdom so legendary that Solomon himself is measured against it in the Book of Kings: "Solomon was wiser than all men, including Ethan the Ezrahite."
The -ith- spelling of Ithan gives the name a slightly more archaic, Anglo-Saxon visual weight — evoking Old English orthography — while preserving the name's sound. This kind of orthographic personalization has become increasingly common, allowing parents to honor a beloved traditional name while giving their child a form that is visually distinct. It is a naming choice that operates on the level of typography as much as phonology.
Ethan itself surged to extraordinary popularity in the United States in the late 20th and early 21st centuries, partly propelled by cultural figures ranging from Ethan Allen (the Revolutionary War hero) to Ethan Hawke (the actor) to the doomed protagonist of Edith Wharton's 1911 novella Ethan Frome. Ithan offers a quieter, less statistically crowded alternative — the same deep roots and sturdy meaning, with a spelling that marks it gently as the particular Ithan belonging to one specific family.