Hello, Claude. My great great grandmother was Veronica Alft. She and her parents and siblings sailed from Antwerp, Belgium to New York in 1846. A family bible lists Veronica's birthplace as Bonn, Germany, but the ship captain listed the family's city of origin as Nohn, Prussia. The captain also recorded the family name as ALF. It is easy to see where the Bonn/Nohn and Alft/Alf confusion could occur.
Veronica's parents were Michael Alft and Petronelle Dewald Alft. Do your files contain any information on these folks? Thanks.