His entire name is Damon Lee Fizzy. I don't think Damon ever said in his videos that Fizzy was his last name, but I'm pretty certain "Fizzy" accually is his last name.
It is Francesco. Damon's full name is Damon Francesco Salvatore.
DeeFizzy's real name is Damon Fizzy.
Damon Vracin's birth name is Damon A. Vracin.
Les Damon's birth name is Lester Damon.
Damon Andres's birth name is Andres, Damon James.
Damon Runyon's birth name is Runyan, Alfred Damon.
Damon Berryhill's birth name is Damon Scott Berryhill.
Damon Pfaff's birth name is Damon Matthew Pfaff.
Damon Stoudamire's birth name is Damon Lamon Stoudamire.
Damon Pampolina's birth name is Damon Phillip Pampolina.
Damon Wayans's birth name is Damon Kyle Wayans.
Damon Weber's birth name is Damon Daniel Weber.