loch (n.)youdaoicibaDictYouDict[loch 词源字典]
late 14c., from Gaelic loch "lake, narrow arm of the sea," cognate with Old Irish loch "body of water, lake," Breton lagen, Anglo-Irish lough, Latin lacus (see lake (n.1)). The Loch Ness monster is first attested 1933.[loch etymology, loch origin, 英语词源]