Don't really have any ideas on the origins of this one Daividh, but here are a couple of websites you might find useful.
This list of names from 13th-century Paris includes a few names which may be related (Hugon, Huet, Hue).
http://www.sca.org/heraldry/laurel/names/paris.html
Kate Monk includes Huon on her site.
http://www.flick.com/onomastikon/Europe-Medieval/France.htm
Where did you find references to this name?