Counterfactual
The Parallel Lives of Leylani and Bertha
In 263 girls, Leylani found its level. 50 years earlier, Bertha occupied that same statistical address.
1999–2025
Leylani
Peak year
2025
Peak births
263
Latest count
263
Status
Rising
Peak generation
Gen Alpha
1880–2025
Bertha
Peak year
1918
Peak births
5,051
Latest count
30
Status
Endangered
Peak generation
Greatest Generation
In 263 girls, Leylani found its level. 50 years earlier, Bertha occupied that same address. One peaked in the Greatest Generation era; the other in the Gen Alpha world. They never met. But the data remembers them both.