Denni \d(en)-ni\ as a girl's name is a variant of Dena (Old English) and Denise (French), and the meaning of Denni is "valley, follower of Dionysius". The baby name Denni sounds like Danni, Denna, Denny, Dennie, Deni and Donni. Other similar baby names are Benni, Jenni and Genni. View a list of the 2 names that reference Denni.