Arnego

The Arnego River is a river in the province of Pontevedra, Galicia, Spain. It is a tributary of the Ulla.

Etymology
According to E. Bascuas, "Arnego", registered already as Arnego in 853, would derive from a form *Arnaikom or *Arnekom, belonging to the old European hydronymy, and derived from the Indoeuropean  root *er- 'flow, move'.