En réponse à Jean-François Colson :

>A quarter of an hour is enough to go from Lille (France) to Tournai
>Should /gilE~/ be more common in Belgium and /ZislE~/ more common in France?
>After all Lille (Rijsel in Dutch) has been a part of the Netherlands during
>the Middle-Age and Dutch is still spoken in the Northern half of Belgium and
>a bit in France near the border.

According to Vincent (my colleague), his grandfather spoke Dutch when he 
was a child. It's when going to school that he was obliged to speak French 
only. French education has never been nice with people who don't speak 
French :((( .

>12 years ago I had a Teacher in Belgium whose family name was Ghislain
>3 years ago in the Université de Valenciennes et du Hainaut-Cambrésis (UVHC,
>in France) there was a student whose family name was Ghislain /ZislE~/.

It seems indeed that those two pronunciations are a Belgium/France thing 
:)) . Funny for a name I thought had a Breton origin :)) .

Christophe Grandsire.

You need a straight mind to invent a twisted conlang.