If you're going to choose this Irish pronunciation of Brian, you have to practice rolling your r's to make it sound even more authentic.
Variations
Brayen
Nicknames
Bray
Popularity rankings from the Social Security Administration
About name popularity rankings
You may find some surprises -- for example, who knew Jennifer was a boy's name? Because this feature uses actual Social Security data, it includes the human error that attends a large survey, but it still reliably reflects the patterns of naming fashion.