Cynethia is a very rare variant of Cynthia that was most common in the 1960s and has all but disappeared.
Cynethia is a girl name. It last appears in U.S. records in 1992. Cynethia first appears in 1955 and peaked in 1967 (15 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1992 | 7 | — | #10,739 |
| 1989 | 5 | — | #12,817 |
| 1988 | 7 | — | #9,493 |
| 1987 | 6 | — | #10,115 |
| 1986 | 6 | — | #9,805 |
| 1985 | 5 | — | #11,014 |
| 1984 | 6 | — | #9,387 |
| 1983 | 8 | — | #7,444 |
| 1982 | 7 | — | #8,413 |
| 1981 | 9 | — | #6,918 |
| 1977 | 15 | — | #4,474 |
| 1976 | 7 | — | #7,451 |
| 1973 | 7 | — | #6,804 |
| 1972 | 11 | — | #4,847 |
| 1971 | 5 | — | #8,587 |
| 1970 | 10 | — | #5,123 |
| 1967 | 15 | — | #3,370 |
| 1966 | 6 | — | #5,934 |
| 1965 | 5 | — | #6,712 |
| 1963 | 6 | — | #6,019 |
| 1962 | 6 | — | #5,992 |
| 1961 | 6 | — | #5,964 |
| 1960 | 5 | — | #6,539 |
| 1958 | 8 | — | #4,589 |
| 1957 | 5 | — | #6,258 |
| 1955 | 7 | — | #4,824 |