What to name a system

We are launching a new performance system and I have recommended the name should be descriptive of what you can do in the system to assist new employees to the organisation and those that only use the system one a year i.e. its where you go to manage yours and / or your teams performance planning and assesment and remuneration online therefore eperformance & remuneration. However there is push back as the system can potentially do more in the future other than just perf and rem. Are there guidelines or best practice to refer to when naming a system i.e. should it be descriptive or should it be catchy that everyone uses and remembers? Also, if we name it something now, can we change it when launching more functionality or is this worse?