Where does “Marguerite” come from?

Marguerite comes from French Marguerite, a feminine given name derived from the Latin margarita meaning pearl.

Ancestry of “Marguerite”, step by step

Step	Language	Word	Meaning
1	French	Marguerite	Margaret; {{m\|en\|Margaret}}
2	Latin	margarīta	—
3	Ancient Greek	μαργαρίτης	pearl; a type of Egyptian plant
4	Proto-Iranian	*mŕ̥ga-ahri-ita-	—