Pearl
Megen is a rare spelling variant of Megan, which is a Welsh diminutive of Margaret. The name ultimately derives from the Greek word 'margarites', referring to a pearl.
Less common today
Megen isn't in the latest US Top 1000. It last peaked at #3,488 in 1991.
US births per 5-year period, 1990βpresent (SSA data).