From Latin Belgae, an Iron-Age European group of tribes located between the rivers Seine and Rhine, from Proto-Celtic *belg-, *bolg- (“to swell (with anger)”), from Proto-Indo-European *bʰelgʰ- (“to bulge, swell”), thus meaning "People who swell (with fury/anger). Also see Old English belgan and Dutch gebelgd.
Belgae pl (plural only)
- (historical) A group of tribes living in northern Gaul, between the English Channel and the west bank of the Rhine, from at least the 3rd century BC.
- Pokorny, Julius, "The pre-Celtic inhabitants of Ireland", Celtic, DIAS, 1960 (reprint 1983), p. 231.