So he changed his name to a that of his Norwegian great-grandfather, Bernt, a fairly typical Norwegian name.
Many years later he moved back to Australia, and quickly discovered the exact same problem: "Bernt" gets pronounced as "burnt"... so he had to change back to Brent.
For me the best part is how the "error" is the same both ways. I see "Brent" derives from burnt ("dweller near the burnt land"), but Bernt is a short form of the German name "Berend" or "Bernhard".