Hi DLS, and welcome.

I don't know much at all about Flemish, but to start you off:

Dunkerque is the French spelling. Duyn Kerke, in the original Flemish, means church of the dunes. Since church in French is l’eglise, I guess the ‘kerque’ has no real meaning, but has just slid across from 'kerke'. German would be kirche.

I meant to add - you probably know already - there is a town called Albuquerque in Andalucia, Spain