Toponymy
The name derives from the old Brittonic *Lātēnses (via Late Brittonic Lādēses), composed of the Celtic root *lāt- "violent, boiling" and the borrowed Latin plural derivational suffix -ēnses meaning "people of the fast-flowing river", in reference to the River Aire that flows through the city. This name originally referred to the forested area covering most of the Brythonic kingdom of Elmet, which existed during the 5th century into the early 7th century.
Bede states in the fourteenth chapter of his Ecclesiastical History, in a discussion of an altar surviving from a church erected by Edwin of Northumbria, that it is located in regione quae vocatur Loidis (Latin, "the region which is called Loidis"). An inhabitant of Leeds is locally known as a Loiner, a word of uncertain origin. The term Leodensian is also used, from the city's Latin name.
Interesting read too
Ian