Wahabite is a term used by collectors and is not correct terminology for these daggers/knives. They are DHARIA (or Sabiki, Sabak et al). A book published by the King Faisal Foundation, Riyadh in 1991 (I have a copy) clearly shows these as Dharia.
If you go to gp's Post #7 above (last para) the dirivation of the term is clearly explained.
Some pics attached of Dharia I used to own.
Also more info here
http://www.vikingsword.com/vb/showthread.php?t=17574 including hilt and blade style names.
Stu