No, it's not. You are incorrect.
It was first used in Taki's Magazine, a spin off of The American Conservative (Buchanan and Taki were founders of that one) in 2009 by then-editor Richard Spencer in the title of an article about rightist dissident and intellectual Paul Gotfried.
The term continued to be used with increasing regularity in Taki's Magazine and among other strands of the dissident right. For instance here is another article from Taki Mag published in 2009: The Alternative Right.
In 2010 Spencer left Taki Mag to start his own on-line magazine/web-site named "Alternative Right", and hosted at alternativeright.com, a URL he has since retired. At that time he went on to found a new web-journal and site, Radix Journal, which is still publishing alt-right themed articles and podcasts weekly.
There was some falling out and change in Spencer's thinking around this time that made him want to move forward without the old site on line, I believe. Many of the writers who had contributed the most to Alternative Right started a blog under that name, using free blogging tool Blogspot. Here is that site: alternative-right.blogspot.com
Applying a real label, or the name of a real group that exists or existed historically, to another group that has nothing to do with that group is a Standard Leftist Tactic. After all we can just look at Trump and his supporters, who have also been continuously called: Fascists and Nazis, two groups that Trump has nothing to do with. The KKK has also been invoked endlessly.
To say Trump and his supporters should have nothing to do with the alt-right is a solid political opinion and tactic. But to claim the alt-right doesn't exist, or is a creation of the left is completely incorrect. Making that claim is destined to end badly for those making it. It is easily proven false, as I have demonstrated here.
These guys talked about “Conservative Right” and “Alternative Right” in the past.
The first use of “Alt-Right” appears to be this year. These guys claimed they first coined it, but they did not use “Alt-Right” when doing so. They used the above names until “Alt-Right” become prominent this year. Then they claimed they were the first to reference it.
I’m not buying into that.
“Alt-right” has been used this year in conjunction with seedy racist name calling. So thanks for the nice links. You made it easy for me to confirm this.
it’s older than that...
In November 2008, Paul Gottfried addressed the H. L. Mencken Club about what he called “the alternative right”.
Am Ren (American Renaissance), another site frequently considered Alt-Right (though it pre-dates the term) had a USA Alexa ranking of #13,384
This matches up with The Center for American Progress, which was rated #13,849.
Free Republic had a USA Alexa rank of #2,338.
Democratic Underground - #3,967.
So, bigger than a vanity blog, but still far behind sites like FR.