Namesakes
Other Royalty:
1 king, 1 prince
Vittorio Emanuele III of Italy (middle name Gennaro) 1900-1946 Italy 
Vittorio Emanuele of Savoy (middle name Gennaro) 1937-1946 Italy
Saints:
1 blessed
Blessed Gennaro Maria Sarnelli 1702-1744