Source: Illerich Family Book; Beate Hammes, cited by Manfred Ruettgers; Ancestry.com—Hamburg Passenger Lists, 1850-1934: 1860-1869 > Direkt Band 016 (11 Jan 1862 - 27 Dez 1862); and www.findagrave.com.
Johann’s brother Josef also is buried in St. Elizabeth Cemetery in Harper, Keokuk County, Iowa.
He immigrated in 1862, departing from Hamburg, Germany on April 22, 1862 on the ship “Hammonia,” and arriving in New York, New York State. His brother Joseph, the Peter Wilhelmi (or Wilhelmy) family, and a woman named Anna Lauxen, all from Illerich, were on the same ship.
He became a naturalized citizen.
In 1900 Johann lived in Lafayette Township, Keokuk County, Iowa with his wife Elizabeth and his brother Joseph. In 1910 he and his wife lived in Lafayette Township with their daughter Katharine, Katharine’s husband Peter Weber, and their children Elizabeth (age 20), Benedict (age 16), Marie (age 13) and Victor (age 6). All of the children were born in Iowa.

Source: Manfred Ruettgers; Barbara Riegelsberger; Albert Emmerich of Cremlingen, Germany; and Ancestry.com—New York, Passenger Lists, 1820-1957; Iowa, Cemetery Records, 1662-1999; and www.findagrave.com.
She arrived in New York, New York on August 22, 1866, along with her daughter Catharine and her sister Anna. They sailed from Bremen, Germany on the ship “Bremen.”
She gave birth to two children, one of whom was living in 1900.