Megan is a diminutive form of Margaret, derived from the Greek name Margareta, which comes from the word "margarites" meaning "pearl." The name has been used primarily in Welsh, English, and Irish cultures since the medieval period, with particular popularity in Wales where it developed as a feminine variant of the Welsh name Meg.
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Baby name data from babynamesuggestion.com. Popularity figures are Australian registry data and remain subject to the originating agencies' terms.