Cydney \cy(d)-ney\ as a girl's name (also used as boy's name Cydney), is pronounced SID-nee. It is of English origin. Variant of Sydney. Cydney has 2 variant forms: Cidney and Cydnee. Baby names that sound like Cydney are Sidney, Sydnee and Cydnie. View a list of the 2 names that reference Cydney.