thorp n.

late 13c., "wine shop," later "public house" (mid-15c.), from Old French taverne (mid-13c.) "shed made of boards, booth, stall," also "tavern, inn," from Latin taberna "shop, inn, tavern," originally "hut, shed, rude dwelling," possibly [Klein] by dissimilation from *traberna, from trabs (genitive trabis) "beam, timber," from PIE *treb- "dwelling" (source also of Lithuanian troba "a building," Old Welsh treb "house, dwelling," Welsh tref "a dwelling," Irish treb "residence," Old English ðorp "village, hamlet, farm, estate"). If so, the original meaning probably was "wooden shed."

1540s, "body of soldiers," 1540s, from French troupe, from Old French trope "band of people, company, troop, crowd" (13c.), a word of uncertain origin, perhaps from Frankish *throp "assembly, gathering of people" or another Germanic source, perhaps related to Old English ðorp, Old Norse thorp "village" (see thorp). OED derives the French word from Latin troppus "flock," which is of unknown origin but also might be from the proposed Germanic source. Of groups of animals from 1580s. Specifically as "a subdivision of a cavalry force" from 1580s; of Boy Scouts from 1908. Troops "armed forces" is from 1590s.