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Well there is an English surname, Hartridge, which I assume you refer to when you mention two separate families. That name is likely to be from a place name, and one source informs that there is a Hartridge in Devon.
As for a German version, I can only suggest you track the name back through the records to try to identify the original.Hart is a not uncommon component of German and Germanic nomenclature, e.g., Hartmann. I did try googling a German translation of Hartridge (Hirschruecken) and got recipes for saddle of venison!