Namesakes
Nobel Prize Winners:
1 physics
(physics) Riccardo Giacconi 2002 
Notable Scientists and Inventors:
1 physicist
Riccardo Giacconi 1931-2018
Olympic Medalists:
1 silver
(silver) Riccardo De Magistris 1976 water polo
Saints:
2 saints
Saint Richard (a.k.a. Riccardo) ?-1196
Saint Riccardo Pampuri 1897-1930