Counterfactual
The Parallel Lives of Shireen and Caitlyn
In 10 girls, Shireen found its level. 50 years earlier, Caitlyn occupied that same statistical address.
1923–2025
Shireen
Peak year
1991
Peak births
40
Latest count
10
Status
Declining
Peak generation
Millennial
1968–2025
Caitlyn
Peak year
1998
Peak births
2,937
Latest count
71
Status
Endangered
Peak generation
Gen Z
Shireen and Caitlyn peaked in the same cultural weather — the Millennial naming world. They are not replacements; they are siblings separated by 50 years, occupying the same statistical address at different addresses in time.