Invented brand name, suitable for a range of applications.
The name "killy" has only five characters and only two syllables. Two-syllable names are extremely rare and exceptionally prestigious. Leading companies using two syllable names include Disney, Gillette and Sony.
Killy.com is a .com domain. Dot com domains are the most valued top-level-domain in the world, used by famous websites like twitter.com. A .com is the first thing people think of when they think of a website.