Norse-Irish North Atlantic naming

I am playing with a TL starting in in the 840s PoD involving more Norse power in Ireland and also more Irish influence on the Norse. However the main thrust of this PoD is a slightly more Irish Norse settlement of the North Sea and eventually alt Vinland.

What would they call these places of alt Iceland/Greenland/Vinland and what could they call and where can I go to get a sense of place naming for such a world?
 
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