Masculine dossier · first seen 1915

Mamoru

Extinct Near statistical disappearance

Peak era

1924

Peak births

Current vitality

Dormant

Peak generation

Greatest Generation

Quick answers about Mamoru

Mamoru has not appeared in SSA records since 1937. It is effectively extinct as a new baby name — no boys received it in the latest available data.

The median age of a living American named Mamoru is approximately 94 years, with most bearers falling between 89 and 97 years old.

No. Mamoru is extinct in new births; the SSA last recorded it in 1937.

Mamoru has its strongest geographic signal in Hawaii, where it appears 273.4× more often than the national baseline.

1915Peak 19242025

Peak year

1924

Decline from peak

100%

2025

All-time

182

Mamoru disappeared from SSA records in 1937 and has not been seen in 88 years. Its absence is now longer than many names' entire recorded lifespan.

Mamoru peaked in 1924, when 16 boys were given the name.

No boys 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 182 Americans named Mamoru since 1915.

Rarity scoreStatistical floor

Peak generationGreatest Generation

StabilityHighly era-bound

TrajectoryNear statistical disappearance

Living profile

Estimated living Americans with this name.

Median age96

Core range91–100

Playground Density Index 0.0%

Wave type

Flash Flood

A concentrated generational spike rather than a slow classic.

Geographic heartland

Hawaii

273.4× higher affinity than the national baseline.

Hawaii · 1920s 273.4×