If nothing else throughout his career, Conor McGregor has earned a reputation for his bold, polarizing personality.On top of being a UFC featherweight and lightweight champion, becoming the first fighter to hold UFC championships in two weight classes simultaneously, McGregor has grabbed headlines in his career for other reasons, from legal troubles to callouts of other fighters."The Notorious," then, only seems like a fitting nickname — but how did McGregor initially earn his famed moniker?Here's what to know about McGregor's "Notorious" nickname.MORE: Why Dana White said UFC will not be returning to White HouseWhat is Conor McGregor's nickname?McGregor has long been referred to as "The Notorious."It's been a part of his fighter persona, which has been centered around trash talk and getti