Where does “Mag” come from?

Mag is a diminutive form of Margaret, which derives from Late Latin Margarīta, from Greek margarítēs meaning "pearl."

Ancestry of “Mag”, step by step

Step	Language	Word	Meaning
1	English	Margaret	—
2	Middle English	Margaret	—
3	Old French	Margaret	—
4	Latin	margarīta	—
5	Ancient Greek	μαργαρίτης	pearl; a type of Egyptian plant
6	Proto-Iranian	*mŕ̥ga-ahri-ita-	—

Mag — Etymology, Origin & Word History | Etymology Explorer