When Johann Michael Frohnhafer was born on 22 June 1811, in Germany, his father, Peter Frohnhafer, was 40 and his mother, Susan, was 41. He married Sarah Donat on 17 November 1844, in Stark, Ohio, United States. They were the parents of at least 1 son and 1 daughter. He died on 13 April 1889, in Clearspring Township, LaGrange, Indiana, United States, at the age of 77, and was buried in LaGrange, Indiana, United States.
Vernacular form of Johannes .