My last name is Jackmore and I have been told that it was changed to Jackmore from DiGiacomo sometime around the time period you have indicated in your email. My grandfather's name was Anthony Jackmore and he was born in NYC in 1899. His father was named James DiGiacomo(Jackmore) and would have been alive around the same time as Fastino DiGiacomo ( I suspect that they may have been brothers??. My father tells me that James DiGiacomo (Jackmore) died sometime around the turn of the century. At the time of his death he had 4 sons (John, Harry, Anthony(Born 1899) and James. The four boys with their mother moved to NYC where their mother ultimately remarried and had three girls with her new husband. The family settled in Manhattan. Ultimately, my grandfather married and settled in Woodside, Queens NY.
Sounds like more than a coincidence. Please email me directly if you would like to discuss further.
Robert Jackmore (email: Robert_W_Jackmore@email.mobil.com)