Won 33 World Heavyweight Championship fights
In his professional achievements we can find 3 bouts where he conquered Heavyweight title (against Sonny Liston in 1964, against George Foreman in 1974 and Leon Spinks in 1978). And according to the data in here (this site), in the WBA and WBC champions' information we can find that in his 3 times as champ Ali defended succesfully his titles 30 times, that makes a total of 33 won fights for the World Heavyweight Championship. (The bout against Ernie Terrell in 1967 to regained the WBA belt that Muhammad was stripped in 1965 is including in that 33)
On the boxing record page, there is a BIG error in fact noted about Ali's change of name after the first Sonny Liston bout. Ali first announced his name changed as Cassius X, not Muhammad X. A couple of weeks later, he announced to the world that he'd "now forever be known as Muhammad Ali -- Muhammad means worthy of praise and Ali mean most high," the champ said to a band of boxingscribes. This information is easily found in umpteen bios and autobios of the GOAT. One can go to "The Muhammad Ali Story" at Youtube and hear Ali said that in video footage of that time.