Help connect Goethe's secretary Eckermann to the Common Tree

Question

During the recent Connect-a-Thon, the connections of notable German literary editor Johann Peter Eckermann (who is best known as secretary of famous Johann Wolfgang von Goethe) increased from two to nine, but that wasn't enough to connect him to our Common Tree. Can you find the missing links?

Btw, you can connect two notables for the price of one: Johann Peter's son Karl also is notable (his profile was created during the Thon!); he became an artist, notable for his paintings and sketchings.

Comments

Six days later and he's still at 9 connections.

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It's really frustrating: I cannot connect his non-Eckermann relatives found on the German genealogy.net search, neither his mother (LNAB Schierhorn) to other Schierhorn in Asendorf, nor his wife (LNAB Bertram) to other Bertram in Northeim or Hannover, nor his brother-in-law Gerdau to other Gerdau in Winsen. There must be a link, just not at the site(s) that I have access to ...

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According to {{Ancestry Tree|78669003|36394722641}}, his paternal grandfather is Jakob Eckermann (1699 Echern to 9 Feb 1774 Handorf) his paternal grandmother is Anna Meins (*12 Nov 1699 Mover, +1776 Handorf). This will not help in connecting, though, and it is not a primary source either.

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Thanks, Sven!

Would his grandfather's birth place be Echem? I couldn't find Echern.

Btw, I don't have access to ancestry.