Being a native speaker of
German and knowing something about
German names, I can only give a negative answer: I don't know any
German given name that only slightly resembles Terrunder.
A remote hypothesis (and probably far-fetched) would give the following derivation: The
German name and surname
Erdmann (interpreted as "earth man") may get humanised to a Latin-Greek mix form Terrander that may be phonetically respelled as Terrunder. Searching for "Terrander" makes this hypothesis improbable, Terrander as a surname has an extremely low frequency and I cannot locate
German people with that name.
This message was edited 1/29/2016, 12:03 AM