Hi Patrick,

I hope this message finds you well, it's been awhile since you posted. My name is George Seder. Here is my lineage down to my Grandfather William James:

Hyronimus Sitter (Son Heinrich Sitter)
Birth: Berstett, Bas-Rihn, France
Death: circa 1656 France

Heinrich Sitter (Married to Eva Sitter) (Son David Sitter)
Birth: circa 1632
Death: circa 1673 (Age 41)

David Sitter (Married to Anna Maria Sitter) (Son Johann George Sitter)
Birth: circa 1657
Death: circa 1738 (Age 81)

Johann George Sitter (Married to Anna Magdalena Sitter) (Son Theobald Sitter)
Birth: October 15, 1708
Death: November 1, 1785 (Age 77)

Theobald Sitter (Married to Anna Barbara Sitter) (Son Johann Niclaus Sitter)
Birth: February 8, 1739
Death: May 30, 1774 (Age 35)

Johann Niclaus Sitter (Married to Barbara Sitter) (Son Niclaus Sitter)

Niclaus Sitter (Married to Barbara Sitter) (Son Jacob Sitter)
Birth: March 14, 1797
Death: June 18, 1844 (Age 47)

Jacob Sitter(Seder) (Married to Mary Sitter) (Son Matthew Seder)
Birth: 1827
Death: 1902 (Age 75)

Matthew Seder (Married to Barbara Seder) (Son George Seder)
Born: February 17, 1853
Death: 1928 (Age 75)

George Seder (Married to Susie Seder) (Son William James Seder)
Born: 1892
Death: June 26, 1956 (Age 64)

William James Seder (Married to Vera Seder)

The story goes that Jacob Sitter changed his name at the request of his wife Mary when they immigrated to Michigan from Ontario, Canada. We've been Seder's ever since. I hope that the pre-Johann Nicolaus Sitter lineage helps you on your quest. Please share whatever you may have found.
bayesoft @ hotmail . com
I see that there is yet another variation out there *Setter*
:)