low (adj.)youdaoicibaDictYouDict[low 词源字典]
"not high," late 13c., from lah (late 12c.), "not rising much, being near the base or ground" (of objects or persons); "lying on the ground or in a deep place" (late 13c.), from Old Norse lagr "low," or a similar Scandinavian source (compare Swedish låg, Danish lav), from Proto-Germanic *lega- "lying flat, low" (cognates: Old Frisian lech, Middle Dutch lage, Dutch laag "low," dialectal German läge "flat"), from PIE *legh- "to lie" (see lie (v.2)).

Meaning "humble in rank" is from c. 1200; "undignified" is from 1550s; sense of "dejected, dispirited" is attested from 1737; meaning "coarse, vulgar" is from 1759. In reference to sounds, "not loud," also "having a deep pitch," it is attested from c. 1300. Of prices, from c. 1400. In geographical usage, low refers to the part of a country near the sea-shore (c. 1300, as in Low Countries "Holland, Belgium, Luxemburg," 1540s). As an adverb c. 1200, from the adjective.[low etymology, low origin, 英语词源]
LuxembourgyoudaoicibaDictYouDict
European state, from Germanic lutilla "little" + burg "fort, castle." Related: Luxembourgeois; Luxembourger. Hence also lushburg (mid-14c.), Middle English word for "a base coin made in imitation of the sterling or silver penny and imported from Luxemburg in the reign of Edward III" [OED].
Spartacist (n.)youdaoicibaDictYouDict
German Bolshevik of November 1918 uprising, 1919, from German Spartakist, from Spartacus (d.71 B.C.E.), Thracian leader of Roman Servile War (73-71 B.C.E.), ultimately from Sparta; the name was adopted 1916 as a pseudonym by Karl Liebknecht in his political tracts; thence Spartacist for the socialist revolutionary group he founded with Rosa Luxemburg and Franz Mehring.