Loiner is a demonym, describing the citizens of Leeds.
The Rugby league club Leeds Rhinos were previously nicknamed the Loiners.
[1] While there are several theories, the actual origin of the term remains uncertain.
The three competing theories are: The term Leeds Loiner was included by Joseph Wright, a native of nearby Windhill and Wrose, in the English Dialect Dictionary.
The entry suggests that the origin is linked to Marsh Lane in Leeds.