Floofanym (floofinition) – the other names by which a housepet is know, either to one another, or to the people they live with; a housepet’s secret name; the names given to a housepet seen by others when their real name(s) aren’t known.
In use: “Although her name was Jade, her floofanym was Pokey, given for the lazy deliberation with which she enjoyed investigating things.”