River names

DRINON (today Dri, ~ni) and DRILON, two river names, attested from
ancient times, I think that are close related to PIE root *rei- `to
flow, run'. Suffixed zero-grade form of this root is *ri-nu- (cf.
English run). There are all chances that river name Drinon is a
prefixed form *ad- + rinu- (cf. Alb. <dëborë> `snow' < *ad- + bhe:r-
eH2, besides <borë> `id.'; dvarr `to be hurted' from *ad- +
*worna: `wound', bdjerr < dbjerr `to lose' < *ad- + *bher-no, etc.).
Also we treat river name Drilon as prefixed form of suffixed zero-
grade form *ad- + *ri-l- > Drilon (cf. English <rill>).
Quite curiously we find also attested this river name with this
prepostion even in ancient times as Ad Drinos, where we see that it
regain its primary form, for this preposition seems to loose its
meaning, used as prefix.
This habit to make compound noun of river name I have noticed also in
place name KRILEVA < k- + ril- + Slavic suffix -eva, the village
through which flow the river.
This root is also present in Albanian in an o-grade form *roi-nu > ren
(d) `to run, to hurry'.

Konushevci