Where does “manichaeus” come from?

manichaeus (Latin) comes from Ancient Greek Μανιχαῖος, from Classical Syriac ܡܐܢܝ ܚܝܐ — Living Mani.

Ancestry of “manichaeus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Μανιχαῖος	—
2	Classical Syriac	ܡܐܢܝ ܚܝܐ	Living Mani

manichaeus — Etymology, Origin & Word History | Etymology Explorer