Invented brand name, suitable for a range of applications.
The word "killy" contains only five characters and only two syllables. Two-syllable names are very rare and exceptionally valued. Leading companies using two syllable names include Gucci, Walmart and Visa.
Killy.com is a .com domain. Dot com domains are the most valuable top-level-domain in the world, used by famous websites like twitter.com. Once you own a .com, it will be much easier to rank for your own name in Google.