Hi,
there were far more Ackermann´s in Hamburg than Akerman or Akkermann, but all names are listed. Akerman(n) and Akkermann are sometimes found in the north of Germany, especially on the island of Borkum from where it spread to other parts. I personally knew somebody by the name of Akkermann, but as Dave said, Ackermann is a likely option. In 1939 there were 3 E. Ackermann, one Eduard Ackermann (butcher) one von Akerman and two Akkermann (but of those no "E"). Listed are only those inhabitants who either owned a place or were main tenant. Not those who subletted
GreyC