There are cognate suffixes in the German-speaking areas (ending on -wyk, -wik, -wig, etc.) but -ich is not one of them. German -ich is equivalent to -ik in Dutch-speaking areas.
From a Norwegian perspective the Dutch word Wick sounds like the Norwegian word Vik or cove, bay, inlet in English. If you look at the coastal location of these towns that link seems to make some sense.
Wick is not a word that I know of, do you mean Wijk (neighborhood)? Like Noordwijk en Katwijk? Because that's almost certainly not related to 'bay'. Many coastal towns are named something with a 'dam' however (Amsterdam, Rotterdam, Monnikedam).
I keep thinking that this is the origin for Vikings.
I've pondered over this for ages since half of me comes from the Danish town of Vig; inland now but only after Sidinge fjord was drained for farming.
