Namesakes
Olympic Medalists:
1 gold
(gold) Gaston Reiff (middle name Ghislaine) 1948 5000 m 
Other Royalty:
1 princess, 1 queen consort, 1 royal consort
Lilian Baels (middle name Ghislaine) 1941-1951 Belgium
Mathilde of Belgium (middle name Ghislaine) 2013- Belgium
Delphine of Belgium (middle name Ghislaine) 2020- Belgium