How old is someone named Sybil?
The average Sybil is 56 years old.
Half of all living Sybils are between 41 and 78. The average sits between a large older group and a younger one, so many Sybils are much older than 56.
When was Sybil popular?
Few names are as steady as Sybil. It peaked in 1921, but babies have been named Sybil every year since records began, and 152 were in 2025.
Popular names of 1921 · The most popular names of the 1920s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 640 | 0 |
| 1910s | 2,509 | 0 |
| 1920s | 4,442 | under 100 |
| 1930s | 3,119 | 700 |
| 1940s | 2,709 | 1,500 |
| 1950s | 1,887 | 1,500 |
| 1960s | 1,396 | 1,200 |
| 1970s | 931 | 880 |
| 1980s | 471 | 450 |
| 1990s | 198 | 200 |
| 2000s | 150 | 150 |
| 2010s | 735 | 730 |
| 2020s | 811 | 810 |
How many Sybils are still alive?
About 8,200 Sybils are alive in the US today. That's 40% of the roughly 20,000 babies named Sybil since 1881.
Most Sybils ever born have died: the name was most popular in 1921, long enough ago that many of those babies are gone.
What generation is the name Sybil?
About one in three living Sybils are Baby Boomers, born between 1946 and 1964.
Is Sybil an old name?
Yes. Sybil is older than 84 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Sybil will be 34 in 2056, so its average age will actually fall, as the youngest Sybils make up more of the total.
Is Sybil a boy or girl name?
Almost entirely girls: over 99.9% of living Sybils are women.
Names the same age as Sybil
NAME TWIN
Sybil's name twin is Della. Of all 3,713 names on AgeByName, Della's age curve is the closest match to Sybil's: 88% alike.
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Questions about the name Sybil
How old is the average Sybil?
The average Sybil in the US is 56 years old. The median is 64, so half are older and half younger.
How many people are named Sybil?
About 8,200 Sybils are alive in the US today, out of roughly 20,000 babies given the name since 1881.
When was the name Sybil most popular?
In 1921, when about 540 baby girls were named Sybil.
Is Sybil a Boomer name?
Partly. Baby Boomers are the largest group, about 34% of living Sybils, but the name spans several generations.
Estimates from Social Security Administration baby-name records (births 1880–2025) and SSA cohort life tables (2026 Trustees Report). Updated each spring. How we calculate this