Counterfactual
The Parallel Lives of Jacy and Mackenzie
In 14 girls, Jacy found its level. 50 years earlier, Mackenzie occupied that same statistical address.
1961–2025
Jacy
Peak year
1992
Peak births
150
Latest count
14
Status
Declining
Peak generation
Millennial
1973–2025
Mackenzie
Peak year
2001
Peak births
6,934
Latest count
1,343
Status
Declining
Peak generation
Gen Z
Jacy and Mackenzie 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.