Where does “Isabella” come from?

Isabella derives from Old Spanish Isabel, of unknown ultimate origin.

Ancestry of “Isabella”, step by step

Step	Language	Word	Meaning
1	English	Isabel	—
2	Spanish	Isabel	—
3	Portuguese	Isabel	—
4	Old Occitan	Elisabel	—
5	Latin	Elisabeth	—
6	Ancient Greek	Ἐλισάβετ	—
7	Hebrew	אלישבע	my God is an oath; the Lord is her oath
8	Hebrew	אֵל	a God; God, deity; god, God
9	Hebrew	שמואל	—
10	Hebrew	שְׁמוּאֵל	—