Etymology of "Belgium": From the Celtic Belgae Tribe

"Belgium" derives from the Belgae, a Celtic tribe in the region during Roman times. Belgae likely stems from Celtic belg ("to swell/bulge"), possibly describing the tribe's physique or fierceness. Romans used Belgica for the wider region (modern Belgium, Netherlands, Luxembourg). The suffix -ica means "land of." Thus, Belgium = "land of the Belgae."