Some Spehardic Family names .... Alhadeff, Bekhor, Douek, Lisbona, Modiano, Souroujon, Rousso, Cavaliero, Marzouk and Taranto. Descendants of these families are indeed related to each other.
The Modiano and Dwek families also have shown a probable common ancestor.
Douek (Sephardic) E1b1b1-a1b 13-24-13-10-16-18-11-12-12-14-
FamilyTreeDNA.com Sephardic Heritage .... (about 40 % on this list are E1b1b1)
Signatures: A statistical study of the Y-chromosomes among a large number of Jewish individuals in Europe has found 10 clusters of DNA (mostly Ashkenazim). These are called “signatures.” In our Sephardic study, we have found 17 unique signatures, indicating that Sephardim have more genetic diversity than do Ashkenazim. The possible reasons for the greater diversity among the Sephardim are complex and the subject for another, separate article. These signatures cover all of the typical haplogroups found among the Ashkenazim except for R1a, which was non-existent in our sample. A unique signature is an indication that some men were not related to a particular community where other signatures were prevalent. They may have immigrated into that community and/or were converted to Judaism (as was common in Roman times for freed slaves of Jewish families).