Counterfactual
The Parallel Lives of Hayleigh and Mallory
In 28 girls, Hayleigh found its level. 50 years earlier, Mallory occupied that same statistical address.
1986–2025
Hayleigh
Peak year
2010
Peak births
323
Latest count
28
Status
Endangered
Peak generation
Gen Z
1938–2025
Mallory
Peak year
1986
Peak births
3,325
Latest count
825
Status
Stable
Peak generation
Millennial
In 28 girls, Hayleigh found its level. 50 years earlier, Mallory occupied that same address. One peaked in the Millennial era; the other in the Gen Z world. They never met. But the data remembers them both.