I was actually going to say the exact same thing.
I think it stems from the fact that there a lot of black africans in London, many of whom come from Catholic backgrounds. That's the only assumption I can make.
I used the term "know" as if, like, know persoanlly. Which I don't, so ignore that. Basically you're the first person I've spoken to called Patrick and not jsut people I've heard/seen called Patrick.