Invented brand name, suitable for a range of applications.
Killy has only five characters and only two syllables. Two syllable names make popular global brands. Two syllable names are used by established brands like Delta, YouTube and Starbucks.
Killy.com is a .com domain. Dot com domains are the most sought after top-level-domain in the world, used by famous websites like facebook.com. A .com is the first thing people think of when they think of a website.