The river Adur, which passes by Shoreham, is the same name as the Adour,
a great river in the Western Pyrenees.
This coincidence seems to show that it is neither a Basque word, nor a
Saxon. Whether it is a mere expansion of _ydwr_, the water, in Welch, I
cannot pretend to say, but probably it includes it.
We have the Douro in Spain; and the Doire, or Doria, in Piedmont.
Pompadour is clearly derived from the above French river, or some other
of the same name.