Perhaps you should include your source of information.
http://www.meertens.knaw.nl/voornamen/VNB/index.php says this name is a variant of Meine, and this is the short form of several Germanic names starting with the 'Mein' (or Megin: strength) element, like
Meinhard for example.
(KNAW is the
Royal Dutch Academy of Sciences, so not the worst source imaginable).