How old is someone named Josiah?
The average Josiah is 14 years old.
Half of all living Josiahs are between 7 and 19.
When was Josiah popular?
Josiah is a modern favorite: it climbed through the 2000s and hit its high in 2017. 5,522 babies got the name in 2025.
Popular names of 2017 · The most popular names of the 2010s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1900s | 77 | 0 |
| 1910s | 308 | 0 |
| 1920s | 278 | 0 |
| 1930s | 206 | under 100 |
| 1940s | 164 | under 100 |
| 1950s | 195 | 130 |
| 1960s | 173 | 140 |
| 1970s | 945 | 860 |
| 1980s | 4,433 | 4,200 |
| 1990s | 10,983 | 11,000 |
| 2000s | 33,411 | 33,000 |
| 2010s | 63,282 | 63,000 |
| 2020s | 34,664 | 34,000 |
How many Josiahs are still alive?
About 150,000 Josiahs are alive in the US today. That's 98% of the roughly 150,000 babies named Josiah since 1880.
Nearly every Josiah ever born is still alive, because almost all of them are young.
What generation is the name Josiah?
More than half of living Josiahs are in Gen Alpha, born in 2013 or later.
- Gen X under 1%
- Millennial 7%
- Gen Z 37%
- Gen Alpha 56%
Is Josiah an old name?
No. Josiah is one of the youngest names around: younger than 85 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Josiah will be 28 in 2056, so the name is aging slowly.
Is Josiah a boy or girl name?
Almost entirely boys: 99.7% of living Josiahs are men.
Names the same age as Josiah
NAME TWIN
Josiah's name twin is Genesis. Of all 3,713 names on AgeByName, Genesis's age curve is the closest match to Josiah's: 95% alike.
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Questions about the name Josiah
How old is the average Josiah?
The average Josiah in the US is 14 years old. The median is 12, so half are older and half younger.
How many people are named Josiah?
About 150,000 Josiahs are alive in the US today, out of roughly 150,000 babies given the name since 1880.
When was the name Josiah most popular?
In 2017, when about 7,100 baby boys were named Josiah.
Is Josiah a Gen Alpha name?
Yes. About 56% of living Josiahs are in Gen Alpha, born in 2013 or later.
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