It’s funny how we tend not to attach last names to people anymore.
In almost any given environment with a reasonably large number of people (maybe less a very professional workplace), we tend not to differentiate people of the same name by using their last names but instead attach an adjective that best describes (or conjures an image of) them.
For example, the country of origin is one of the common adjectives used in schools with a number of international students. E.g. China John, Malaysia John, Korea John… The next most common adjective used then are physical attributes such as size, height, smell (LOL) or other distinct attributes such as sexual orientation, a peculiar behaviour, dress sense and so on.
I guess it’s easier to attach these characterising adjectives in certain situations, especially if the nature of their last name makes it hard to remember or pronounce.
Just an observation.