Namesakes
Notable Actors and Entertainers:
1 actor
Milton Sills (a.k.a. Gustavus) 1882-1930 
Notable Military Figures:
1 commander
Gustav II Adolf (a.k.a. Gustavus) 1594-1632
Notable Musicians:
1 composer
Gustav Holst 1874-1934
Swedish Kings and Queens:
2 kings
King Gustav II Adolf (a.k.a. Gustavus) 1611-1632
King Gustav III (a.k.a. Gustavus) 1771-1792