while he converted to Islam before his first fight with liston, it wasn't until shortly afterward he announced his conversion, and his name change, first to Cassius x and then to Muhammad Ali.
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Because Clay was a Slave name.
Clay converted to Islam and changed his name from Cassius Clay, which he called his "slave name", to Muhammad Ali.
1964, shortly after winning the world title for the first time. http://en.wikipedia.org/wiki/Muhammad_Ali