Where does “Isaiah” come from?

Isaiah derives from Ancient Greek Ἠσαΐας, which was borrowed from Hebrew יְשַׁעְיָהוּ, a name of uncertain ultimate meaning.

Ancestry of “Isaiah”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Ἠσαΐας	—
2	Hebrew	יְשַׁעְיָהוּ	—

Isaiah — Etymology, Origin & Word History | Etymology Explorer