Incánus was Gandalf's name among the Southern peoples.

Its meaning can be interpreted in many different ways, and is therefore uncertain:

Incánus may have been a Quenya adaptation of a word used by the Haradrim meaning "North spy". Incánus in Latin means "Grey-haired". It may also have been a purely Quenya name, possibly given by the men of Gondor, meaning "Mind-ruler".
Encyclopedia entry originally written by Simbelmyne