Beginnings:

The franchise actually originated in 1894 as the Milwaukee Brewers, playing in the minor league Western League.
Major League Debut:

In 1901, they joined the newly formed American League but relocated to St. Louis, becoming the St. Louis Browns. This nickname referenced an earlier Browns team from the same city.
Moving and Rebranding:

After 52 years in St. Louis, a group of Baltimore investors purchased the team in 1953. They chose the new name Baltimore Orioles, inspired by the iconic Baltimore oriole bird and reflecting the city's strong connection to the bird since the early 1800s.
Present Day:

Since 1954, the team has proudly embraced the Baltimore Orioles name, becoming deeply woven into the city's fabric and earning the nicknames "The O's" and "The Birds" from their fans.