Its source is sidan eg, an Old English name meaning "Wide meadow."
This girl's name is used in English.
The name Sydney ranked 22nd in popularity for females of all ages in a sample of 2000-2003 Social Security Administration statistics, 1011th in popularity for females of all ages in a sample of the 1990 US Census and 65th in popularity for females of all ages in a sample of the 1994 US Census.
This name first made its appearance on state popularity lists of the 1990s, and has been trending upward in usage ever since.
Some have derived this surname from the Norman French place name St. Denis. However, the documents supporting this derivation have been denounced as forgeries.
Why would such documents be forged? Perhaps we can find our explanation in the one-time fashion among British aristocrats of tracing their family lines back to the Norman French conquerors of 1066.