"When it was decided to divide the town of Union, there was no argument over calling Town 7, Concord, but there was a great divergence of opinions as to what to call Town 8.
To satisfy all factions, it was agreed to put the letters of the alphabet on slips of paper and have young Mary Piper draw them until a word was formed that could be used as the town name. The result was Ixonia. This is the only town of that name in the United States. It was established as a town in the year 1846."
Via The Romance of Wisconsin Placenames