First off, linguistically, that name instantly says Eastern Europe to
me, not Hannover, unless Napolean brought them back with him 
Are
you sure that last birth record wasn't a clerical error in the
churchbook, where a birth in another family was combined on the page
somehow? I can't find any town with that name, either, but I found
someone's posting about their Mirowitz family name which was found in
"Bedzin" area of Poland? Tongue-twister to be sure.