Well I certainly didn't know 'Kevin' was a generic term for a BAME person. I've only heard it used generically recently for someone who didn't seem very bright, but I thought then, and think now that it was silly.
I know a few people who were christened/named (whatever) Kevin and they were, I think, all ethnic majority, and some were bright and some less so, but so are the David and Johns that I've met. Might used differently in Zimbabwe, where Ballance originally came from, but I don't think I've ever discussed names with people from that country.