A-rod
No ... the most home runs Cobb hit in a season was 12 in 1921 and 1925.
Alex Rodriguez hit 40+ home runs in a season eight times.1998, 1999, 2000, 2001, 2002, 2003, 2005, 2007
Vinny Castilla with 3 ... he hit 40 home runs in both 1996 and 1997 and 46 home runs in 1998.
Jose Canseco in 1988.
Rogers Hornsby hit 42 home runs in 1922.
'40-40 player' is a term used for someone that hits 40 (or more) doubles and 40 (or more) home runs in the same season.
Bonds hit 40 or more home runs in a season eight times -- in 1993 (46), 1996 (42), 1997 (40), 2000 (49), 2001 (73), 2002 (46), 2003 (45) and 2004 (45).
As of the 2008 season, four MLB players have had 40 home runs and 40 stolen bases in one season. The youngest was Alex Rodriguez at 23 years of age. Jose Canseco was 24, Alfonso Soriano was 30, and Barry Bonds was 32.
122 different players have had a total of 295 40-HR seasons.
Ripper Collins of the St. Louis Cardinals with 35 in the 1934 season.
Mickey Mantle did it 2 or 3 times
Yastrzemski, Carl (1)