Some of those nicknames changed over time or died with the team, while some are still in use today. All of the nicknames of the "classic 8" NL teams of 1900-1952 were originally unofficial. But once an unofficial nickname became popular enough, it might be adopted by the team and become official. This practice was already coming into vogue by 1901 and the formation of the American League; four of the upstart league's eight franchises had official team names right from the start. A couple of teams stuck with a name for several years and then changed it to something else, such as the Cleveland Napoleons > Indians, but most teams have never changed their names once officially adopted (other than teams which relocated to a new city). Some teams have had ""two"" popular nicknames simultaneously for many years. Examples: