the largest Australian city located in southeastern Australia on the Tasman Sea; state capital of New South Wales; Australia's chief port
"Sydney is a vibrant metropolis that serves as both the state capital of New South Wales and Australia's busiest port."
A surname, from Old English, a spelling variant of Sidney.
"Sydney is a common surname in England that originated as an alternative spelling of Sidney."
The names of the cities in Australia and Canada come from Thomas Townshend, 1st Viscount Sydney, a British politician who lived from 1733 to 1800. The term itself is derived from his surname, which was originally used as both a family name and a given name.