Every US commentator is pronouncing it as Christian Brown and they shouldn’t be because last time I checked there’s no A or U in the word Brown. It should be pronounced like the word brawn (as in physical strength). I’ve been to school with kids with same surname and they definitely didn’t pronounce it Brown. What’s the story here?
Braun is a german name and the -au- in german equals the pronounciation of the -ow- in Brown. So hes pronounced correctly.