Maybe it's because I'm french, but middle names is something we don't really do here in Quebec.

I know that many US peeps all give middle names to their kids and sometimes even go by their own middle name.

Are middle names popular everywhere else too?

I have a middle name (when I got baptized, but it was this whole church rule "Mary + Godmother name") so ya, I've never used it, nor do I know anyone who has.