If your name is also your URL (ie, web address), they'll automatically know where to go.
For example, when people think of thesitewizard.com, they don't have to wonder what web address to type into their browser to get there. Imagine if your business (or website) is called "Acme", but somebody else holds that domain name.
If so, you might simply want to try to buy over the domain name from the current owner.
I know that a number of people seem to think that your domain name really must be some generic name like "cars.com" if you are selling cars.Witness, for example, how much money those generic names are being sold for.You probably should be aware that they are likely to want to charge a higher fee than you'll normally get when buying new domains (assuming they want to sell it in the first place).On the other hand, if you're just starting out, you might prefer the cheaper alternative of trying to obtain a domain name first, and then naming your website (or business) after the domain that you've acquired.The very name that you use to advertise your product is the name that you will want for your domain, because that is the first thing that people will try in their browser.
It is also the easiest thing for them to remember, and whatever that is easily remembered, will be more likely to be tried out than the obscure domain name.
What if you cannot get the domain name of your choice?
It really depends on how committed you are to that particular name.
So if you've acquired, say, the domain name "acme.com", then your website and business might be named "Acme" or "acme.com".
I know this seems a bit like putting the cart before the horse, but that's the reality if you don't want to lose out on the Internet.
by Christopher Heng, Before you rush out and choose your domain name or name your website, you might want to consider the following points: Naming your site after your domain may seem obvious to some of you, but you'll be surprised to learn that not every website is named after the domain name even when the webmaster owns that domain name.