My father, Louis Lehrman, was born in NYC in Nov. 1908. His father was Anshel, his mother was Nachuma Lipshutz. Anshel and Nachuma were from Warsaw, Poland. Anshel was estranged from his brother, David, the only sibling that I'm aware of. I believe that David had a son, also named Louis, who might have been a doctor, dentist or lawyer.
I know that there are Lehrmans out there, but I don't know how to determine if they are my relatives.