I can only add that Hein is a German name, and iirc geese is half German. Hein (or Hain, like Samhain) is the short form of Heinrich (engl. Henry). Hein stands for "home(-land), "rich" (wealthy) or simply "Mighty"'
There is also folklore about a "Freund Hein" or "Gevatter Hein" (trnsl. Friend Hein or Father Hein), a personification of Death.
He also has an uncanny resemblance to Faust/Faustus from black butler (Kurotsuchi?), who also shares a German name from Goethe's book Faust.
OR... I'm reading too much into it xD
Just thought I'd share some info since I'm German.