The story
From Sydney + -sian (c. 1837). Potentially derived from the sound /-dʒ(ə)n/ used in Glaswegian or Norwegian, with the g substituted by an s.
Etymology from Wiktionary, CC BY-SA 4.0.
Sydnesian
Today it means: A native or inhabitant of the city of Sydney, New South Wales, Australia. Full definition →