- Johann Ockenfels, age 24, is on a Passenger list for the Robert M Sloman arriving in the Port of New York from Antwerp, Belgium on May 12, 1855. He is listed as originating from Prussia (German) and headed to Wisconsin.
- On the ship with him, although listed ten lines above him, is Anna M. Ockenfels and then Anton Ockenfels. Their age is 59, origin, destinations are all the same as his.
There is a John Ockenfels naturalized on June 22, 1878. He lists his arrival in New York in 1855 and was living in Milwaukee. His birth date was 1831. Witnesses were max Garlach and Michael Schilz.
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