RootsChat.Com

I am at a dead end.  I think my father's surname is not spelled correctly.   Iwan Hoderewski born in Lomza, Poland.  He was born Oct 14, 1917 in lomza, had 2 sisters and 2 brothers.  I have lots of information but without the correct spelling, I'm not sure where to look.  I have street addresses and cities where they lived and he was in the Russian cavalry in 1941.  Captured and a Pow in Germany. Anyone had any luck with finding the correct spellings of names?  Any information would be helpful.