The river name is derived from the word langr which means "long".

The first element is probably an old river name of the Snilldalselva.

The meaning of the river name is unknown (perhaps "the broad one").

The river name is derived from svartr which means "black/dark".

The meaning of the old river name is unknown.

The river name is derived from the word leirr which means "clay".

The meaning of the river name is probably "the quiet one".

The meaning of the river name is from the valley or vice versa.

The river name is, maybe, derived from the word lax which means "salmon".

It may be found at the origin of river names as: