Surviving Kingdom of *Lotharingia (medieval TL questions)

Hey everyone,

I'm thinking of starting up an early-medieval TL for my own entertainment, the basic gist of which is the conquest and heavy settlement of a surviving *Lotharingia in the Low Countries and Rhine area by Vikings. I want to Norsify/Danify/Scandinavify/whatever some of the place names in that region, and I'm hoping someone might be able to point me to where I could get a better idea of how to rename key towns and cities so they at least "sound" Old Norseish. Places like Aachen, Cologne, Utrecht, Antwerp, etc.; any websites out there that would enlighten me as to how these settlers would pronounce their names as the Danes did with Eoforwic -> Jorvik.
 
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