Many fans are interested, why Chief Keef nicknames himself as “Sosa”. Keith had three reasons to choose that moniker. First of all, it comes from the name of Chicago based baseball player Sammy Sosa. Then, it’s taken from Gucci Mane mixtape “Gucci Sosa”. Finally, Alex Sosa was the name of a man, who killed the character Tony Montana, depicted by Al Pacino in the movie “Scarface”. These three reasons made Chief Keef take such a nickname.