Feminine dossier · first seen 1918

Guillermina

Stable Decline Gradual decline from 1966

Peak era

1966

Peak births

Current vitality

Below reporting floor

Peak generation

Gen X

1918Peak 19662025

Quick answers about Guillermina

An estimated 1,544 living Americans are named Guillermina.

Guillermina fell below the SSA's 5-birth reporting floor in 2025. It is extremely rare as a new baby name.

The median age of a living American named Guillermina is approximately 50 years, with most bearers falling between 36 and 63 years old.

Not especially. Guillermina has been declining since its 1966 peak and registered 0 births in 2025.

Peak year

1966

Decline from peak

100%

2025

All-time

1,925

Guillermina last appeared in SSA records in 2024. Across its recorded history, about 1,925 American girls received the name.

Guillermina peaked in 1966, when 40 girls were given the name.

No girls were recorded with this name in 2025 — at least not five of them (the SSA's reporting floor).

Down 100% from its peak.

In all, the Social Security Administration has recorded about 1,925 Americans named Guillermina since 1918.

Rarity scoreStatistical floor

Peak generationGen X

StabilityHighly era-bound

TrajectoryGradual decline from 1966

Living profile

1,544

Estimated living Americans with this name.

Median age50

Core range36–63

Playground Density Index 0.0%

Wave type

Steady Decline

A name with a broad middle and a downward recent trajectory.