Sipchen. HELP please

I am searching for Sipchen in Germany. On documents I have, either Germany or Prussia is usually listed. However, one document does list Westphalia.

Specifically I am looking for these Sipchens: F.A. (male), Mary (wife) DOB 1804, and children: John J., Anton/ Antone, and Katherine. They all headed for U.S.A. around 1855. I am searching all over. However, am having problems. Can someone please help me here. I am desperate to find information on Sipchen. In the U.S. records of ships, the closest I can find is Si??? .....not much help to be sure.

I have John J. Sipchen as being born in 1836, Anton/ Antone/Anthony is 1839, and Katherine as around 1830 ( if i read the numbers correct).

I beg for any help and assistant that anyone can give. And appreciate any and all assistance in this issue.