Nickname

For years many sources have listed the early Boston AL team as the "Pilgrims", but researcher Bill Nowlin has demonstrated that the name was barely used, if at all, at the time. The name Red Sox, chosen by owner John I. Taylor after the 1907 season, refers to the red hose in the team uniform beginning 1908. Actually, Sox was adopted by newspapers needing a headline-friendly form of Stockings, as "Stockings Win!" in large type would not fit on a page. The Spanish language media sometimes refers to the team as Medias Rojas for Red Stockings.
The name originated with the Cincinnati Red Stockings, 1867-1870 member of the pioneering National Association of Base Ball Players. Managed by Harry Wright, Cincinnati adopted a uniform with white knickers and red stockings, and earned the famous nickname, a year or two before hiring the first fully professional team in 1869. When the club folded after the 1870 season, Wright was hired to organize a new team in Boston, and he did, bringing three teammates and the "Red Stockings" nickname along (Most nicknames were then only nicknames, neither club names nor registered trademarks, so the migration was informal). The Boston Red Stockings won four championships in the five seasons of the new National Association, the first professional league.
Boston and a new Cincinnati club were charter members of the National League in 1876. Perhaps in deference to the Cincinnati history, many people reserved the "Red Stockings" nickname for that city with the Boston team commonly referred to as the "Red Caps" today. Other names were sometimes used before Boston officially adopted the nickname "Braves" in 1912; that club is now based in Atlanta.

In 1901, the upstart American League established a competing club in Boston. For seven seasons, the AL team wore dark blue stockings and had no official nickname. They were simply "Boston", "Bostonians" or "the Bostons"; or the "Americans" or "Boston Americans" as in "American Leaguers", Boston being a two-team city. Their 1901-1907 jerseys, both home and road, simply read "Boston", except for 1902 when they sported large letters "B" and "A" denoting "Boston" and "American." Newspaper writers of the time used other nicknames for the club, including "Somersets" (for owner Charles Somers), "Plymouth Rocks," "Beaneaters," and the "Collinsites" (for manager Jimmy Collins)"
The National League club, though seldom called the "Red Stockings" anymore, still wore red trim. In 1907, the National League club adopted an all-white uniform, and the American League team saw an opportunity. On December 18, 1907, Taylor announced that the club had officially adopted red as its new team color. The 1908 uniforms featured a large icon of a red stocking angling across the shirt front. For 1908, the National League club returned to wearing red trim, but the American League team finally had an official nickname, and would remain "The Red Sox" for good.
The name is often shortened to "Bosox" or "BoSox," a combination of "Boston" and "Sox" (similar to the "ChiSox" in Chicago or the minor league "PawSox" of Pawtucket). Sportswriters sometimes refer to the Red Sox as the Crimson Hose and the Olde Towne Team. However, most fans simply refer to the team as the "Sox" when the context is understood to mean Red Sox