Baseball team names which start with the letter B include:
Brewers
Braves
Browns (1902-1953 in St. Louis)
Bees (1936 -1940, Boston)
Beaneaters (1883-1906, Boston)
Broncos (1902, Cleveland)
Blues (1901, Cleveland)
Bridegrooms (1896-1898, 1888-1890, Brooklyn)
Blue Jays (1943-1944, Philadelphia)
Brown Stockings (1883-1884, St. Louis)
Buffalo Buffeds/Blues (1914-1915)
Bullets
Barrachudas
Bengals
Blits
Bombers
Bulldogs
Bandits
Blaze
Ball Busters
Base Bullies
Usually about thirteen players re on each team. Sometimes twelve.
bentley
Benicar
Blitzen
Of course! Everyone loves softball so matty b must love it too :)
Autumn. You lied about the b.
brenda
Begonia
Buckeye Tree
Beelzebub
Boston
Broad Walk