I have only gone back as far as my first generation immigrant, Hermann Heinrich Tegenkamp.He was born October 27, 1805 in Dinklage, Oldenburg Germany, so yes, was probably a far off relative of your 7 X great grandmother.I have found one christening for a Hermann Heinrich Tegenkamp, and this is it:
Hermannus Henricus TEGENKAMP
Christening:23 Mar 1807
Roemisch-Katholische, Bakum, Oldenburg, Germany
Father:Joannes Henricus TEGENKAMP
Mother:Catharina Gertrud BERNHORST
I don't know if this is my ancestor or not.