My gr grandmother is Louise Voelker Markgraf b. 1854,dd 1937..Louises' father is Wm or Gotfreid Voelker. I visited with a relative Oden Voelker of Wilton, WI in late 1970's. Oden told me of a relative..with last name of Voelker who was Postmaster General of Berlin. Not sure of dates.. Do any other persons researching Voelkers of Germany know if this is true or false?