Definitions of Sydney:

• noun:   the largest Australian city located in southeastern Australia on the Tasman Sea; state capital of New South Wales; Australia's chief port
• name:  A male given name (rare: 1 in 14285 males; popularity rank in the U.S.: #848)
• name:  A female given name (rare: 1 in 12500 females; popularity rank in the U.S.: #1011)
• name:  A surname (very rare: popularity rank in the U.S.: #45206)