In 2018, 20 is the most common age for an American (U.S.) Megan who is registered female with the Social Security Administration. It is the 113th most common female first name for living U.S. citizens.
― Anonymous User 10/18/2018
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My sister is Megan Victoria, pronounced MEE-gan. Mum originally wanted it pronounced Megg-an but it never caught on. My UK relatives call her Megg-an though, and she's known as Meg in the family.