(I'm not related)

Did you mean the Boppard in Germany? I don't find one in Georgia, USA.

This may be the two Fredericks?

1880 Chambersburg, Mercer Co. NJ
Frederick Petry 27 Prussia, Milk Dealer
Bertha " 19 Prussia
Frederick " 4/12 (Feb) NJ

1900 Trenton, Mercer Co. NJ
Fredric Petry, Jan 1853 Germany, widow, to US 1873, Milkman
Fredric Petry, Feb 1880 NJ, Clerlk State House
Martha Petry, Jul 1882 "
Charlie Petry, Nov 1885 "
Walter Petry, Sep 1894 "
Emma Petry, Apr 1897 "
Carolina Petry, Aug 1823 Germany, Mother

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

1900 Trenton, Mercer Co. NJ
Fred Petrey, Jul 1869 Germany, to US 1888, Rope Maker
Rachel Petrey, Nov 1869 " " "
Katie Petrey, Oct 1889 NJ
Bertha Petrey, Feb 1893 "
Carrie Petrey, Jun 1894 "
Frederick Petrey, Aug 1894(?) "
Rose Petrey, Jun 1897 "
Elsie Petrey, Apr 1899 "

1910 Trenton, Mercer Co. NJ
Fredrick Petry 40 Germany, to US 1890, Rubber Worker
Nechima Petry 40 " " "
Katherine Petry 20 NJ
Bertha Petry 17 "
Caroline Petry 15 "
Fredrick Petry 14 "
Rose Petry 12 "
Elsie Petry 11 "
Mabel Petrey 9 "
Emma Petrey 8 "

1920 Trenton, Mercer Co. NJ
Frederick Petry 50 Baden, Germany, to US 1889
Gratinna Petry 50 " " " "
Rose Petry 23 NJ
Mable Petry 19 "
Emma Petry 18 "
Frederick Petry 16 "
Grattina Kent 5 " Grandson
Catherne Wintenborn 30 " Daughter
Catherne J Wintenborn 1 " Grandchild

I can't identify either of the Fredericks in passenger lists.