from: Wisconsin. A new general atlas, comprising a complete set of maps representing the grand divisions of the globe, together with the several empires, kingdoms and states in the world; compiled from the best authorities, and corrected by the most recent discoveries. New York, Published at Tanner's Geographical Establishment, 1845. Written and engraved by Jos. Perkins.
Courtesy: David Rumsey Historical Map Collection via oldmapsonline.org
Zooming in on Winnebago County in 1845 reveals a mysterious naming of "Mishwauka,"and the more familiar "Winnebago," as in "Winnebago Rapids," the original name for Neenah. Obviously, refinement of place names would occur later. Notice "Oskosh," "Manitoowoc," and "De Pierre" to name just a few. (This map is my first and only exposure to the name, "Mishwauka" so more research is definitely in store.)