Here is what I found.
My Great grandmother, Catherine Saragusa Ribando's sister, Beatrice Saragusa, married Marco DeGuardi. They had three children: Andrew, Grace and John. In researching this family, I found a California death cert for Anthony (Andy) Divodi that listed his parents as Marco and Beatrice De Guardi. I have only started this family line of research, but have found information from other ancestry trees so be very helpful. Since you mentioned that you thought he had changed his name to the one that I have included his picture (i actually still have him separate in that tree until I can gather more sources), there is a good chance that he is both De Guardi and Divodi. Maybe the Divodi was a "stage" name?