Meaning and Origin of Family Name

If anyone knows the meaning of Yaun (no matter the spelling), please send it to me so I may include it on this page. I would also like to include family crests. If you have a Yaun crest, I would appreciate showing it here. I have been told it is Irish, Scottish and/or Scandanavian .HELP!!!! As I find meanings for the variants in the spelling of the surname, I will add it below.