Where does “Caín” come from?

Caín (Spanish) comes from Latin Cain, from Ancient Greek Κάϊν, from Biblical Hebrew קַיִן.

Ancestry of “Caín”, step by step

Step	Language	Word	Meaning
1	Latin	Cain	—
2	Ancient Greek	Κάϊν	—
3	Biblical Hebrew	קַיִן	—

Caín — Etymology, Origin & Word History | Etymology Explorer