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I would be a little surprised if the origin wasn't related to Hebrew "tower of god." Sometimes names are proposed as Hebrew origin that are a stretch, but this is as literal as it gets - migdal means tower, yah means god. Quick googling shows most websites claim that too, although I'm not going to link them because they're not necessarily reliable in general.

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The other option I can think of if this name is used mainly by Catholics is that this name is related to Magdalene.