Invented brand name, suitable for a range of applications.
Killy has only five letters and just two syllables. Two syllable names make popular global brands. Two syllable names are used by established brands like WeChat, Walgreens and Pocket.
Killy.com is a dot-com domain. Dot com domains are the most prestigious top-level-domain in the world, used by famous websites like google.com. When you own a dot-com, it is much easier to rank for your own name in search engines.