Guenhwyvar
Guenivere
Guffaw
Guffy
Guga (after the tennis player Gustavo Kuerten)
Guido
Guinevere
Guinness
Gulliver
Gully
Gumba
Gumba-gumba
Gumball
Gumbo
Gumby
Gumby And Pokey
Gumdrop
Gummie Bear
Gummitch
Gumnut
Gump
Gumpo
Gumps
Gumto
Gung Ho
Gunner
Gunsmoke
Gunter
Gunther
Guppy