The baby name Cydney appears in baby name data for the United States from 1954 to 2018. It was most popular in 1998 with 217 babies given the name.
In the later years of this period, Cydney has become more popular compared with earlier years.
| Year | Count |
|---|---|
| 1954 | 5 |
| 1957 | 16 |
| 1964 | 5 |
| 1972 | 5 |
| 1985 | 5 |
| 1987 | 34 |
| 1988 | 20 |
| 1989 | 31 |
| 1990 | 44 |
| 1991 | 38 |
| 1992 | 101 |
| 1993 | 96 |
| 1994 | 148 |
| 1995 | 208 |
| 1996 | 189 |
| 1997 | 212 |
| 1998 | 217 |
| 1999 | 155 |
| 2000 | 186 |
| 2001 | 90 |
| 2002 | 100 |
| 2003 | 128 |
| 2004 | 114 |
| 2005 | 122 |
| 2006 | 70 |
| 2007 | 83 |
| 2008 | 58 |
| 2009 | 64 |
| 2010 | 49 |
| 2011 | 19 |
| 2013 | 5 |
| 2014 | 11 |
| 2017 | 5 |
| 2018 | 5 |