Origin of the name Sydney: Transferred use of the surname originating as a Norman baronial name taken from the place-name St. Denis in Normandy. Alternatively, the name arose independently in England and is derived from the Old English elements sīd (extensive, wide) and ieg (island in a river, riverside meadow).
Origin and Meaning of Cidney. "Cidney" is a name of English origin, and it means "Variant of Sydney". It's a name commonly given to girls.
English Meaning: The name Cydnee is an English baby name. In English the meaning of the name Cydnee is: meaning "From St. Denis.".