I have seen some conversation regarding this surname. My maiden name is Ressa. My family is from New York. I think my great grandfather's name was Ludovico Ressa. He came to New York in the turn of the century. My family has lived in the NYC area for many years. His son was Frank (my grandfather) who had three sons, Ludwig (my father) James and Frank Jr. THe later is the only one living. We are a small family and I do not know much of anyone who might be in Italy. I heard they were from Naples. I do not know if my great grandfather Ludovico had any brothers or sisters who might have also come here.
My grandfather Frank had only two sisters, Mary and Lily. They are both gone now. Lily is the only one who had one child who mI believe has also passed on. My uncles all had children and live on Long Island now.