What do you mean for original name? a brand name, a real name or something else?
In my personal opinion, using keywords in a domain is better for search engines and easy to get high rankings but for a long term a brand name can help you develop your PR (Public Relations) and your trademark.
So one needs to weigh what role the domain will play for the site: seo or branding. Each has its relevant value dependent on what we are doing (or what our business is). Is the site a branded business or more a mechanism for sales, traffic, or other which can also be a subsidiary to a branded business (or website).
Here is what I can suggest to you about your domain name.
If your domain name is intended for your brand, then keep it as your brand name. If the brandname you chose with the TLD that you want is not available, try and find a workaround.
For example: If you own a Packers/Movers business called Moving In, try something creative like Moving.In or something along those lines.
My previous workplace was a magazine. Since the domain name with the Magazine name wasn't available, we added mag to the domain: xyzmag.com
Avoid super short domains. If a domain is comprised of a word or two, it is easier to remember. The domain is for Humans, the rest of the url can be for machines. But the domain must be human friendly.
Having a keyword in your domain, like super-car-loans.org.uk makes it not only look cheap and tacky, but may also push away potential customers who might mistake it for a phishing scam.
Also, avoid domains that sound similar to major brands. Especially if they are in your line of business.
My take: Original name for a brandable business, keyword based domain for a feeder site.
Yet, there are many examples that break the rule. Natural News is a keyword based domain that has grown into a brand.