Abstract business name, based on the word "cog".
The word "Cogby" contains only five letters and only two syllables. Two syllable names make popular global brands. Established brands using two syllable names include Lego, Twitter and Dropbox.
Cogby.com is a dot com domain. Dot com domains are the most popular, and the most sought after. When you own a dot com, it is much easier to rank for your own name in search engines.