His name comes from the following:
- Gabriel – Continues the tradition of El-/-el names in the family, and as previously mentioned, because of its religious symbolism..
- Baudouin is for his great-uncle, King Baudouin of Belgium.
- Charles is for his maternal uncle and godfather, Count Charles-Henri d'Udekem d'Acoz
- Marie is for the Virgin Mary, as per tradition with Catholic royalty.