Domenico Ercoli "Eckley" DiMeo and Ercoli "Eckley" Soprano are two different people, SC. Eckley DiMeo was the founder of the DiMeo Crime Family (which is the "Soprano Crime Family's" official name) and Eckley Soprano was never involved with the Family.

If you would like to learn more about the DiMeo Crime Family's roster, you should read about it here: http://en.wikipedia.org/wiki/DiMeo_Crime_Family