Where does “Belgium” come from?

Belgium comes from Latin Belgium, a name of uncertain origin and meaning.

Ancestry of “Belgium”, step by step

Step	Language	Word	Meaning
1	Latin	Belgium	—
2	Latin	Belgica	—
3	Latin	belgicus	Belgic
4	Latin	Belgae	the Belgians; Belgians
5	Proto-Celtic	bolg-	to swell
6	Proto-Indo-European	bʰelgʰ-	to bulge, swell

Belgium — Etymology, Origin & Word History | Etymology Explorer