A nickname like that is generally something that needs to come from someone else, not the person in question.
Francis Tiafoe, who is usually called "Big Foe" explained about his nickname. He's a professional tennis player from the US...
Those who have watched Frances Tiafoe play on the ATP Tour will likely have noticed that he goes by the moniker “Big Foe.”
Whether it’s signing a camera, the jewelry hanging around his neck or the fans shouting out his name, when Tiafoe steps onto the court, he becomes Big Foe. But where did this nickname come from?
“I had two friends growing up, and we talked about what college we would go to,” Frances Tiafoe explained recently.
“They said, “If you play for the Georgia Bulldogs, they’ll call you “Big Foe,” wooh wooh!”
“That was kind of like a funny thing, and then it just stuck.”