Namesakes
Belgian Prime Ministers:
4 prime ministers
Henri de Brouckère (a.k.a. Ghislain) 1852-1855 
Jules de Trooz (a.k.a. Ghislain) 1907
Frans Schollaert (a.k.a. Ghislain) 1908-1911
Henri Carton de Wiart (a.k.a. Ghislain) 1920-1921
Notable Actors and Entertainers:
1 actor
Patrick Bauchau (a.k.a. Ghislain) 1938-
Saints:
1 saint
Saint Ghislain ?-680