I believe the name originates from the Argyllshire area - but confess I know little about the origins.
Have you tried
Rampant Scotland Directory ? It is a Scottish-based website which has lots of clan information. Another (not so good) is
Electric Scotland is all about the history of Scotland and the Scots. which also has lots of clan information. I would caution you that both sites admit they accept articles/information as submitted - they do not check it for authenticity.
Good luck with your research.