kettleyoudaoicibaDictYouDict[kettle 词源字典]
kettle: [13] Latin catīnus denoted a ‘deep pan or dish in which food was cooked or served’. Its diminutive form catillus was borrowed into prehistoric Germanic as *katilaz, which passed into Old English in the form cetel. This produced Middle English chetel, which died out in the 15th century, having been ousted by the related Old Norse form ketill.

Originally the term denoted any metal vessel for boiling liquid, and it is only really in the past century that its meaning has narrowed down to an ‘enclosed pot with a spout’. The original sense lingers on in the term fish kettle, and is still very much alive in related Germanic forms such as German kessel and Swedish kittel.
[kettle etymology, kettle origin, 英语词源]
kettle (n.)youdaoicibaDictYouDict
Old English cetil (Mercian), from Proto-Germanic *katilaz (compare Old Saxon ketel, Old Frisian zetel, Middle Dutch ketel, Old High German kezzil, German Kessel), probably from Latin catillus "deep pan or dish for cooking," diminutive of catinus "bowl, dish, pot." One of the few Latin loan-words in Proto-Germanic, along with *punda- "measure of weight or money" (see pound (n.1)) and a word relating to "merchant" that yielded cheap (adj.). "[I]t is striking that all have something to do with trade" [Don Ringe, "From Proto-Indo-European to Proto-Germanic," Oxford 2006]. Spelling with a -k- (c. 1300) probably is from influence of Old Norse cognate ketill. The smaller sense of "tea-kettle" is attested by 1769.