Fabulous or infernal region beneath the waves in such early Welsh texts as Breuddwyd Rhonabwy [The Dream of Rhonabwy]. Like the Irish cognate Lochlainn [..or 'Lochlann'..], Llychlyn comes also to mean Scandinavia, its definition in contemporary Modern Welsh.
So, initially Lochlann/Llychlyn was the name for a region beneath the waves, but later it became the name for Scandinavia.
Maybe because the Vikings came from the same direction (let's say, the north-east as seen from Ireland) as where once the original Lochlann/Llychlyn was located?
Now, if the Doggerlanders would have wanted to sail to ancient Ireland, then they would have to go north, pass by Scotland, and then go south again to reach Ireland, and so apparently coming from the north or north-east in the eyes of the people inhabiting ancient Ireland.
Edited by Abramelin, 16 March 2010 - 02:25 PM.