I'm a Project Manager. This wasn't exactly a recognized profession a few decades ago, but over time people realized they needed someone who could actually manage projects effectively and knew how to do it. What I am now I would not have been decades ago.
In fact, in my area of work, video games, Project Management isn't as common as other organizations. It's becoming more prominent, and some jobs are being reclassified as Project Management. My profession is growing by simple changes in terms.
One of the hardest things in our careers is to find a way to describe ourselves. That few words we use to describe our job, our business, etc. acts as a touchstone, a symbol, for what we think of ourselves, what we do, how we relate to people.
The only problem is its changing all the time.