If you’re thinking of starting up online, or creating a new blog, finding a memorable name can be a great way of boosting your chances of success.
But, choosing one can be really tricky, Before you rush out and choose your domain name you might want to consider the following points:

1. Make it easy to spell
When you say the domain name out loud, it should be clear how to spell it.
Otherwise, you’ll lose traffic when potential visitors mis-type your address.

The goal is for your domain name to be passed along easily by you and by others. This is more likely to happen if people don’t have to stop and think about how to say or spell it.

2. No hyphens
It’s not very smooth or punchy to specify a hyphen. (“Hi my name is Jane and my domain is fly hyphen fishing dot com.”)

3. Avoid trademarked names
Once you think you’ve found a great domain check that you’re not going to be infringing on anyone else’s copyright.

4. Use keywords
Having relevant keywords in your domain name can be helpful when your site’s listed in the search results. A keyword can help increase your clickthrough rate - which is the number of people who click through to your site.
As you can see, Google highlights the searched keywords - so your listing looks more relevant.

5. Avoid obscure terms
If you are trying to appeal to a wide audience, avoid using niche-specific terms in your domain that someone outside your niche would be unfamiliar with.

6. Choose an appropriate top-level domain
What do I mean by this? The TLD - or top-level domain - is just the ending - the .com .net .org or .co.uk
Lots of people who use the internet will assume your site’s address ends in .com and often that’s what they’ll type in. By all means buy and use a .org or .net address. But, if you do that, it’s best if you own the .com version, too.
Otherwise, your marketing efforts may end up sending traffic to someone else’s site.
As you can see, online retailer Asos owns the .net and .co.uk versions of its name and redirects them to its .com site. This is a great way of making sure it doesn’t lose traffic.

http://www.standontech.com/2015/12/how-to-pick-good-domain-name-for-your.html?m=1