Also, does it have a good domain name free, and a domain name that fits your market? If your market is old ladies, you may want to avoid choosing a ".io" address.
Also, try Googling the name to see what shows up right now (kind of similar to it sounding like something else) and check if the most obvious twitter handle is available or not.
Is it easy to type?
Is the spelling obvious?
Is it easy to pronounce?
Does it explain something?
Does it sound similar to something else? If so, is this a good thing?