Masculine dossier · first seen 1907

Masao

Stable Decline Gradual decline from 1918

Peak era

1918

Peak births

Current vitality

Below reporting floor

Peak generation

Greatest Generation

Quick answers about Masao

How many people are named Masao?

An estimated 39 living Americans are named Masao.

How rare is Masao?

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

How old is the typical Masao?

The median age of a living American named Masao is approximately 44 years, with most bearers falling between 13 and 85 years old.

Is Masao still popular?

Not especially. Masao has been declining since its 1918 peak and registered 0 births in 2025.

Where is Masao most common?

Masao has its strongest geographic signal in Hawaii, where it appears 265.2× more often than the national baseline.

1907Peak 19182025

Peak year

1918

Decline from peak

100%

2025

All-time

1,018

Masao last appeared in SSA records in 2019. Across its recorded history, about 1,018 American boys received the name.

Masao peaked in 1918, when 81 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 1,018 Americans named Masao since 1907.

Rarity scoreStatistical floor

Peak generationGreatest Generation

StabilityHighly era-bound

TrajectoryGradual decline from 1918

Living profile

Estimated living Americans with this name.

Median age86

Core range15–95

Playground Density Index 0.0%

Wave type

Steady Decline

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

Geographic heartland

Hawaii

265.2× higher affinity than the national baseline.

Hawaii · 1910s 265.2×

Hawaii · 1920s 214.1×

Hawaii · 1930s 152.2×