Mecklenburg

plural Mecklenburgs

1. uncountableA historical region in Baltic northern Germany; part of the modern state of Mecklenburg-Vorpommern.

   Men like Fritz Reuter (employing the Mecklenburg dialect) and Klaus Groth (employing the Holstein dialect) have tried to raise it [= New-Low-German, or Plattdeutsch] to a written language.

   1886, H. A. Strong, Kuno Meyer, Outlines of a history of the German language, p. 67f. (https://books.google.com/books?id=OhJKAAAAIAAJ&pg=PA68)

   1 more example

   Since the reign of Charlemagne, this country is divided into High and Low Germany... the provinces of Lower Germany towards the north conſiſt of the Low Country of the Rhine, Triers, Cologn, Mentz, Weſtphalia, Heſſe, Brunſwic, Miſnia, Luſatia, High Saxony upon the Elbe, Low Saxony upon the Elbe, Mecklenburg, Lauenburg, Brandenburg, Magdeburg, and Pomerania.

   1759, George Sale et al., “The Modern Part of an Universal History”, in History of the German Empire, volume XXIX, page 2

2. countableA surname from German.