Masculine dossier · first seen 1985

Tiernan

Stable Cross-generational persistence

Peak era

2007

Peak births

Current vitality

Rare

Peak generation

Gen Z

Quick answers about Tiernan

An estimated 1,461 living Americans are named Tiernan.

Tiernan is very rare among babies today, with 29 boys receiving the name in 2025, down 66.3% from its 2007 peak.

The median age of a living American named Tiernan is approximately 18 years, with most bearers falling between 12 and 23 years old.

Yes. Tiernan is holding steady, with 29 births in 2025 and a consistent recent baseline.

1985Peak 20072025

Peak year

2007

Decline from peak

66.3%

2025

All-time

1,481

Tiernan has been in gradual retreat. The last decade averaged 2.3× lower than the decade before it — a slow, steady fade rather than a collapse.

Tiernan peaked in 2007, when 86 boys were given the name.

In 2025, only 29 boys were given the name.

Down 66.3% from its peak.

In all, the Social Security Administration has recorded about 1,481 Americans named Tiernan since 1985.

Rarity score99th percentile rare

Peak generationGen Z

StabilityModerate cultural durability

TrajectoryCross-generational persistence

Living profile

1,463

Estimated living Americans with this name.

Median age18

Core range12–23

Playground Density Index 0.0%

Wave type

Steady Decline

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