Changing a Website Name

I've got a site that is 9 years old with over 1600 unique articles. I would like to change the name of the site but keep the current domain. The name of the site is not a good keyword and I know with its age and reputation I could rank well if I changed I had a better keyword. It's just the homepage I'm talking about for the keyword, the articles are O.K.
What effect could changing the site name have and is it more likely to be a negative one?

In my opinion you're better off not changing your website's name just for SEO purposes.
Considering your site is over 9 years old, I'm going to guess you have a pretty good fanbase. I'm guessing that a lot of your viewers know your site by its current name (& domain name). Changing your name could lead to a lot of confusion for your viewers.
In the long run, I don't think it'll be worth it.
(Note, that I am thinking from a "branding" point of view, considering the age of you site).

As ibbfresh says, you'll want to keep your current name to keep your brand.

Google is ALL about branding these days and I think you risk some negative results.

Thanks Guys, I'll keep it as it is.