One accepted etymology is simply: Old French “donjon” from Latin “dominium”: http://www.castit.it/pagine/04supporti/glossario/glosdef.html under "dongione".
This Germanic derivation at any price upon an hypothetical chain of hypothetical reconstructions since Proto-Indo-European sounds not very trustworthy to me.
--220.127.116.11 17:02, 4 July 2012 (UTC) Marco Pagliero Berlin
- That would be dominio, as mentioned under donjon#French. Anyway, considering that *dungijǭ is attested in Old English and Old Norse, it's not a purely hypothetical reconstruction. Semantically, the Germanic etymology is actually more straightforward. --Florian Blaschke (talk) 01:44, 1 January 2016 (UTC)