This puzzles me:
In Jürgen Udolph
Die Stellung der Gewässernamen Polens
innerhalb der alteuropäischen Hydronymie, p. 112,
I find (my transl.)
"Already at the beginning of the century J. Rozwadowski had pointed to
onomastic parallels, the oldest attempt AFAIK comes from R. Ferguson
(The River-Names of Europe, London etc 1862, p. 141), who - besides
erroneous results - also connected Drwe,ca/Drewenz
[
http://en.wikipedia.org/wiki/Drw%C4%99ca ]
and Durance/Druentia.
[
http://en.wikipedia.org/wiki/Durance ]
The following names are closely connected with those of
Drwe,ca/Drewenz (zero grade + -nt- suffix and full grade + -nt-
suffix, respectively):
1. Druantia, now Durance, left trib. of the Rhône,
with toponym Druantium and adj. (nautae) Druentici.
2. *Druantia, now Drance/Dranse, left trib. of the Rhône,
with three source rivers Drance.
3. *Druantia, now Drance/Dranse, trib. of the Lac Léman.
4. *Druantia, now Drouance, river in Normandy.
5. *Druentia, analyzed out of the toponym (Forum) Druentinorum in the
Aemilia.
6. *Dru(w)n.tos (or long root vowel ?) in the Byeloruss. lake name
Drywiaty.
7. *Dravant- in the present river name Trionto in Lower Italy.
8. *Dravant- in the (now disused) river name Trounsach, 1350
Trounsach, 1351 dronsach, druonsach, a trib. of the Iller.
As the compunds show, zero grade formations with a suffix -ant-
predominate, beside them appear full grade names extended with the
formant *-n.t-, among which - as W.P. Schmid has shown - zero grade is
frequent. The geographical distribution should be noted: the three
East Prussian and Byelorussian names, beside a number of occurrences
in Italy and Normandy, are matched by three hydronyms in Southern
France and Western Switzerland."
OK, so typical Old European, ie. in this interpretation Venetic names.
How come these are left out of the list:
http://en.wikipedia.org/wiki/River_Derwent
eg this one
http://en.wikipedia.org/wiki/Derwent_Water
(in which there is mysterious fish called the vendace
http://en.wikipedia.org/wiki/Coregonus_vandesius
http://www.thefreedictionary.com/vendace
)?
Torsten