cottageyoudaoicibaDictYouDict[cottage 词源字典]
cottage: [14] The Old English words for a small house or hut were cot and cote, both of which survive – just: cot as an archaic term for ‘cottage’ and cote in dovecote and sheepcote. (Cot ‘child’s bed’ [17], incidentally, is of Hindi origin.) They both derive ultimately from a Germanic base *kut-. Then, probably in the 12th century, one or both of them seem to have been taken up by the language of the gentry, Anglo- Norman, and had the suffix -age added, giving *cotage, which was eventually adopted by English as cottage.

Originally this simply denoted any small humble country dwelling; it was not until the mid-18th century that it began to acquire modern connotations of tweeness.
=> cot, cote[cottage etymology, cottage origin, 英语词源]
cottage (n.)youdaoicibaDictYouDict
late 13c., from Old French cote "hut, cottage" + Anglo-French suffix -age (probably denoting "the entire property attached to a cote"). Old French cot is probably from Old Norse kot "hut," cognate of Old English cot, cote "cottage, hut," from Proto-Germanic *kutan (cognates: Middle Dutch cot, Dutch kot).

Meaning "small country residence" (without suggestion of poverty or tenancy) is from 1765. Modern French cottage is a 19c. reborrowing from English. Cottage industry is attested from 1921. Cottage cheese is attested from 1831, American English, earliest in reference to Philadelphia:
There was a plate of rye-bread, and a plate of wheat, and a basket of crackers; another plate with half a dozen paltry cakes that looked as if they had been bought under the old Court House; some morsels of dried beef on two little tea-cup plates: and a small glass dish of that preparation of curds, which in vulgar language is called smear-case, but whose nom de guerre is cottage-cheese, at least that was the appellation given it by our hostess. ["Miss Leslie," "Country Lodgings," Godey's "Lady's Book," July 1831]