Another possible origin of the name Belgium is from the Latin word "Belgica", which was used by the Romans to refer to the region that is now Belgium, the Netherlands, and Luxembourg. The name Belgica is thought to have come from the Celtic word "belg", combined with the Latin suffix "-ica", which means "land of".
Therefore, the name "Belgium" is likely derived from the Celtic word "belg" and may refer to the Belgae people or the land that they inhabited.