Well, the Semnones with their sacred grove were kind of like the Saudi Arabians in Islam with their Mekka. So they must have been part of the origin....
Ok counting out Northern Germans who already are outliers in their own country. (NWs often looking Dutch or Scando and NEs oftentimes already having...
Most Germans dont pass in Southern France either so go figure. Was a few times there (not even the far South but Rhone Alpes region) and people wise...