Brussels
wiktionary
From Dutch Brussel and French Bruxelles, from Proto-Germanic, composed of the words *brōk(“marsh”) + *sali(“building, room”). [1] The metonymic meaning of Brussels as the European Union stems from the fact that the EU headquarters are based in Brussels.
etymonline
Brussels
capital of old Brabant and modern Belgium, a name of Germanic origin, from brocca "marsh" + sali "room, building," from Latin cella (see cell). It arose 6c. as a fortress on an island in a river. As a type of carpet, from 1799; as a type of lace, from 1748.
Brussels sprouts (Brassica oleracea gemmifera) is attested from 1748 (the first written description of them is from 1580s); they have long been associated with Flanders and especially Brussels (compare the French name, choux de Bruxelles).
