Invented brand name, suitable for a range of applications.
The name "Killy" has only five characters and just two syllables. Two syllable names make popular global brands. Examples of popular two syllable names include Apple, Boeing and Disney.
Killy.com is a .com domain. Dot com domains are the most valuable domain extension in the world, used by famous websites like twitter.com. When you own a .com, it is much easier to rank for your own name in search engines.