"Y Guess" is a great business name for a company or an app that gives you answers to all your guesses.
The name "yguess" has only six characters and just two syllables. Two syllable names make popular global brands. Two syllable names are used by established brands like YouTube, Disney and Ikea.
Yguess.com is a .com domain. Dot com domains are the most prestigious top-level-domain in the world, used by famous websites like twitter.com. When most people think of a website, they think of a .com.