Depends on what you mean by "famous".

In Oz, I have met Sam Soliman (watched a few fights with him), Lovemore N'Dou, Paul Briggs, Bob Miravick, Kostya Tsyu and most of the national fighters at one point or another, to name a few.

From the states, (in passing) Muhammad Ali, and a few of the rest that have appeared in Oz in the last ten years.