Interesting...My Knake family is from around Jever, Germany. My gggrandfather is Frerich Hinrich Knake, born @1830's and he married a Anna Margareta Roelfs from Ogenbargen, Middels, Ostriesland, Germany.
Their children were; Otto Heinrich (my g-grandfather who married a Antje Janssen from Ogenbargen- immigrated to USA in 1892 after marriage), Johann Edward, Mary Elise, Alma, Frederich and Meta. All children came to USA except Frederich, who was said to have 11-13 children.
I just found it interesting that your Knake also married a Roelf. My family came to Iowa, but 2 sisters went to Chicago and another to the Washington DC area.
If any of this sound familiar...I have more information and would love to share.
Thanks in advance, Judi