A possible ancient name by Ptolemy of the Pregolya River is Chronos (from Germanic *hrauna, "stony")[citation needed], although other theories identify Chronos as a much larger river, the Nemunas.

[citation needed] The oldest recorded names of the river are Prigora (1302), Pregor (1359), Pregoll, Pregel (1331), Pregill (1460).

Vytautas Mažiulis instead derived it from spragė́ti or sprógti ("burst") and the suffix -ara ("river").

[1] It starts as a confluence of the Instruch and the Angrapa and drains into the Baltic Sea through the Vistula Lagoon.

You can help Wikipedia by expanding it.This article related to a river in Russia is a stub.