I had never even heard of Walloon until you mentioned it...I guess that's not surprising but I've heard plenty about Catalan
"Walloon is spoken in Wallonia (Belgium). It is also spoken in:
* a small part of France: the botte de Givet in northern Ardennes, and several villages in the Nord département, making it one of the regional languages of France
* a small district of Door County, Wisconsin, USA, owing to fairly large-scale immigration there in the 19th century
* Brussels, by some Walloon residents
Although Walloon was widely spoken until the mid 20th century, today only a small proportion of the inhabitants of Wallonia are fluent in the language. Most younger people (those born since the 1970s) know little more a few idiomatic expressions, often profanities. The Walloon language nevertheless remains a part of the Walloon heritage and as such is one of the foundations of Walloon identity."
http://en.wikipedia.org/wiki/Walloon_language