What is the translation of my guild’s name?
有妖气 is a reference to the comic 十万个冷笑话(100 thousand bad jokes), where 有妖气 is a running gag, literally translates to "there is evil spirit" or like Toosky said, "there is an aura of demons", 客栈 is "Tavern"

The name of the Tavern is called "有妖气", so the best translation is:

"There is evil spirit" Tavern

Correction: Based on the comment, "There is demon aura" is the more appropriate translation