My family has Beckmans too. They are from Hannover, Germany as well. I was just there last weekend :-)
Your spelling of Hannover is the American way in case you didn't know ;-)
If you could help me I have Conrad Miller Beckman, Fredrick Conrad Beckman Sr., Fredrick Conrad Beckman, John Chester Beckman, Cora Beckman and well I have a few others too but that is a start. Thanks!