Tha base name is NARDI from which all variations,alterations and derivations stem. Nardulli is present in greater frequency in Emilia Romagna and Toscana and the entire southern italy. The name was common in the 11th and 12th century with roots to the name Bernardo and Leonardo. There does not appear to be any other reference in the dictionary of italian surnames. As for your family crest, look at it this way, even your name and obvious family had its 15 minutes of fame in the dark ages. Peter.