You need a name that is related to your business, let say your business are into travel, you need to go for vacation.com.ng, vacation.ng, vacations.com.ng vacation.com etc You hve to choose any keyword that is related to your business
You can also try two keywords domain because premium names is always expensive. To be honest two keyword domain sometimes explain your business better like goodfood.com.ng homedesign.com.ng etc
But some time if none of this names is not available you can just twist it with your company name but you must make it simple, brand-able and very easy to remember so that any body that visit your site will easy remember it when they try to visit again. So don’t line up your name, your father and grand father names to name your company, hahaha just kidding but in a serious note, use something like chuckstravels.com.ng, nenevacation.com.ng, sadewears.com.ng you can play around with your name or company names, couple with the keyword that is related to your business, above all make it smart dear!
Read more at http://donrich.blogpost.com.ng/choose-online-business-name-nigeria-must-read/