I was going through the site (ancestry.com) and found Your, well quite old but anyway, question.
There are a few Danielewicz families. Also it can be written Danilewicz, becouse of misstates in books. For example, my grandfather was born as Danilewicz and died as Danielewicz.
Most of Danielewicz are not from the same family. There are some to divide by "herb" and then if You recognize one of them, then its easier to look. They are: Sas, Leliwa, Ostoja, Godziemba, Rola and also some more that I just dont remember now. Also we ave Danielewicz in Kiev Russia and in old Preussen. Basicly, most of Danielewicz's are from (the origin) Lithaenia, Belarus or Western Ukraina (Volyn, "red russia) and the common name for the area is Kresy.