It really depends on how committed you are to that particular name. If you have an existing brand name that you're known for, you'll probably not want to ditch that name just because you couldn't get the domain name. After all, it took you a lot of time and money to establish that name. If so, you might simply want to try to buy over the domain name from the current owner. Check up the "whois.com" information for the domain, and contact that person listed to see if they're willing to sell it. 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. So if you've acquired, say, the domain name "rendc.org", then your website and business might be named "globalguideline" or "rendc.org". 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.