Mr Wilkens presented his ideas in a lecture given at Cambridge University in 1992.
In his talk he mentions other towns in France and Spain as well as river names which he identifies from the Homeric texts.
Historically Troy was known as Illium or variations on that name. Wikipedia claims that there was once an initial 'W' before the 'I'. Whatever that represents.
From Wilkens:
'As we all know, the Trojan War was started by Agamemnon, who was called 'the wide-ruling king', an epithet unjustified if he ruled over the small, northeastern corner of the Peloponnese, but most appropriate in Western Europe, where he ruled over a very vast territory indeed, stretching from the Gironde river in southwest France to the Rhine near Cologne in Germany. We can therefore consider Agamemnon as the first king of France in documented history, whose capital was Mycenae, since called Troyes, situated to the southeast of Paris on the Seine river. His kingdom was called Argos, a name preserved by the Argonne region in northern France. Here, river names have changed very little over time. For instance, the Orneia river in Homer is now the Orne. The same is true for many towns, such as Cleonae, now Cléon and Gonoesse, now Gonesse, both situated near the Seine. But other names changed beyond recognition, such as Corinth, which became Courances after the Middle Ages, when it was still called Corinthia. Similarly, Homer's Tyrins was still called Tirins in the Middle Ages, but has since changed its name to Thury-Harcourt, a little town in Normandy. And Agamemnon's capital Mycenae was apparently renamed Troyes after his victory in the Trojan War, much like in our era the names of victorious battles are given to avenues, squares and buildings in our cities, such as Trafalgar Square or Waterloo Station.'
The whole article can be found here
http://phdamste.tripod.com/trojan.html