Sounds reasonable. But it is noteworthy that the Frisian name 'Menneke' itself is also called a variant of Meine on that site I mentioned. The word menneke (or even 'man') isn't the origin of any surname on there. It's not likely that that is because they never heard of it, there must be a reason we don't know about. You'll agree that menneke==>menneke is even more obvious than your example :D
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