Invented brand name, suitable for a range of applications.
Killy has only five letters and only two syllables. Two syllable names make popular global brands. Established brands using two syllable names include Kleenex, Walmart and Walgreens.
Killy.com is a dot com domain. Dot com domains are the most sought after top-level-domain in the world, used by famous websites like twitter.com. When most people think of a website, they think of a dot com.