Janni is both a given name and a surname. Notable people with the name include:Janni Arnth Jensen, Danish football player Janni Howker, British author Janni Lee Simner, American author Janni Spies, Danish businesswoman Antonio Janni (1904-1987), Italian soccer player Guglielmo Janni (1892-1958), Italian painter Joseph Janni (1916-1994), British film producer Peter Janni known for Janni's chimney in Northport, Washington, United States Janni Serra, German football player