Hello James, From what I've been able to figure out about the clan system is that Atkinson is a family that belongs to the Gordon Clan. There is a lot of confusion about clans on the internet because companies in the business of selling you products make it look like everyone can have their own clan & tartan & crest etc. but it's just not true. My wife's mother was an Atkinson and so I've researched quite a bit. Being Canadian it's difficult to understand the system as its set up but I think you'll find that I'm correct. If you find I'm not please let me know the secret.