How old is someone named Isiah?
The average Isiah is 29 years old.
Half of all living Isiahs are between 19 and 34.
When was Isiah popular?
Parents have been choosing Isiah less often since its peak in 2001; 120 babies got the name in 2025.
Popular names of 2001 · The most popular names of the 2000s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 340 | 0 |
| 1910s | 894 | 0 |
| 1920s | 1,270 | under 100 |
| 1930s | 964 | 120 |
| 1940s | 1,056 | 460 |
| 1950s | 1,009 | 660 |
| 1960s | 687 | 560 |
| 1970s | 541 | 490 |
| 1980s | 1,653 | 1,600 |
| 1990s | 5,477 | 5,300 |
| 2000s | 7,047 | 6,900 |
| 2010s | 2,408 | 2,400 |
| 2020s | 811 | 810 |
How many Isiahs are still alive?
About 19,000 Isiahs are alive in the US today. That's 78% of the roughly 25,000 babies named Isiah since 1880.
Most Isiahs ever born are still alive.
What generation is the name Isiah?
About half of living Isiahs are in Gen Z, born between 1997 and 2012.
Is Isiah an old name?
Somewhat. Isiah is older than 50 in 100 names on AgeByName, but younger than plenty of classics.
Looking ahead: if babies keep getting the name at today's pace, the typical Isiah will be 47 in 2056, so the name is getting older.
Is Isiah a boy or girl name?
Almost entirely boys: 99.9% of living Isiahs are men.
Names the same age as Isiah
NAME TWIN
Isiah's name twin is Gabrielle. Of all 3,713 names on AgeByName, Gabrielle's age curve is the closest match to Isiah's: 89% alike.
Think you can guess a Ashley's age?
Ten names, one slider each. Share your score.
Questions about the name Isiah
How old is the average Isiah?
The average Isiah in the US is 29 years old. The median is 26, so half are older and half younger.
How many people are named Isiah?
About 19,000 Isiahs are alive in the US today, out of roughly 25,000 babies given the name since 1880.
When was the name Isiah most popular?
In 2001, when about 820 baby boys were named Isiah.
Is Isiah a Gen Z name?
Yes. About 53% of living Isiahs are in Gen Z, born between 1997 and 2012.
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