Hello, Emily. I know a bit about this family as I am a descendant. They are from Lomza, Poland, I believe, and the surrounding area. The name means, "son of Daniel". The family is related to the Chmiel
family. (pronounced ham-iel). Actually, you can find out about the family through a newsletter put out by a woman named Marlene Silverman in Washington, DC. I can't recall the name, but the local Family Research Center (Jesus Christ Church of Latter Day Saints) would know. It's for people descended from that area who are Jewish. My background from there is mixed with Catholic. Danielewicz is related to the Kafka Family, The Wstega (vish-tenga) Family.
In fact, the gentleman, Morris Spektor, from Hamden, CT has the printout of the family tree. I believe he is listed in Directory Inquiries. Tell him you are looking for information on the Danielewicz family and he should be able to send you the printout.