Hi All, I am newish at the Jewish research and I am having trouble following surname changes and why they keep changing. I have read all sorts of information and the obvious changes I understand, moving towns, changing jobs etc. I started with my 4th great grandfather Louis/Loeb Dusseldorf in Altona and following headstone information back  his father and Grandfather were Dusseldorf, Louis' great grandfather was a SeGaL from Hannover, his 2x great grandfather was a SeGaL (I think also from Hannover) yet his 3x great grandfather was a Leuwarden (I think). Why did we change from Leuwarden to SeGaL to Dusseldorf (or a variation of)? Thanks in Advance
Tanya Williams 
Cowra, NSW, Australia