Pearl
Maigan is a modern phonetic spelling variant of Megan, which is the Welsh diminutive of Margaret. It ultimately derives from the Greek word 'margarites', referring to a pearl. While the 'Maigan' spelling is rare, it retains the classic etymological roots of its traditional counterparts.
Less common today
Maigan isn't in the latest US Top 1000. It last peaked at #5,011 in 1990.
US births per 5-year period, 1990βpresent (SSA data).