köken: From Middle High German loch, from Old High German loh, from Proto-West Germanic *lok (“lock; hole”). Doublet of Lücke (“gap”) and Luke (“hatch”).
aile: Arschloch, Astloch, Atemloch, aus dem letzten Loch pfeifen, Baggerloch, Blasloch, Bohrloch, Dreckloch, ein Loch in den Bauch fragen, Einschussloch
köken: Since late 17th century. Along with the obsolete lok, borrowed from English log directly and through Dutch log, from Middle English logge, logg, of uncertain but perhaps North Germanic/Scandinavian origin.
köken: Recorded in Astrakhan and among Greben Cossacks. Discernably, a transferred meaning of Kalmyk лох (lox, “aloe vera”), which relates through the Kalmyk home in Dzungaria to Chinese 蘆薈／芦荟 (lúhuì, “aloe vera”), see it for more.
köken: From Proto-Finnic *järvi (compare Estonian järv), from Proto-Finno-Permic *jäwrä (compare Northern Sami jávri, Erzya эрьке (eŕke)), probably borrowed either from Proto-Balto-Slavic *jaurā (compare Lithuanian jáura (“marshland, bog”)) or from earlier Proto-Indo-European *yewHr-.