Namesakes
Baudouin of Belgium
(a.k.a. Gustaaf) (m) 1930-1993 
Other Royalty 1951-1993 Belgium (king)
Guus Meeuwis
(m) 1972-
Notable Musicians
Jan Decleir
(a.k.a. Gustaaf) (m) 1946-
Notable Actors and Entertainers (actor)