Significat

1. A major port city, the state capital of New South Wales, Australia, and the most populous city in Australia.
2. The City of Sydney, the local government area for central Sydney, New South Wales.
3. A seaport and former city in Nova Scotia, Canada, now part of the amalgamated Cape Breton Regional Municipality on Cape Breton Island.
4. An unincorporated community in Hillsborough County, Florida, United States.
5. A surname from Old English, a spelling variant of Sidney.
6. A unisex given name transferred from the surname.