Tiernan

Primarily a boy's name of Irish origin with 1,452 recorded births. Also given to 195 girls.

Boy's nameAlso girl's#4166 in 2024Rising fast

Meaning & Origin

A surname.

Tiernan is a boy's and girl's baby name of Irish Gaelic origin, from the surname Ó Tighearnaigh — meaning 'descendant of the lord' or 'little lord,' from tighearna (lord, master). It was borne by an 11th-century Irish High King, Tiernan Ua Ruairc, a figure of legendary power and treachery in Irish history.

Tiernan has the strong, Celtic character of Irish surname-names like Ronan, Brennan, and Cormac. For parents of Irish heritage seeking a name with genuine Gaelic history and a distinctive sound, Tiernan is a compelling and resonant choice.

EtymologyShow more

Tiernan is built from 7 letters and two syllables — a mid-length form that balances memorability with distinctiveness. Within the Irish naming tradition, this length is typical of names that preserve their full historical form, carrying their etymology on the surface.

The interplay of consonants and vowels in Tiernan creates its characteristic clean, contemporary quality. Two-syllable names are the most common length in American naming, hitting a natural speech rhythm that works across formal and informal contexts.

At a Glance

1,452

Total births

Since 1985

2007

Peak

86 births

1985

First recorded

40 years of data

Compare Tiernan with another name

Popularity Over Time

Tiernan was #1832 twenty years ago and has since drifted to #4166, but its charm endures.

First appeared: 1985Peak: 2007 (86 births)Current: #4166

Popularity by Decade

Decade-by-decade popularity data for Tiernan
Decade	Births	Avg Rank	Trend
2020s	151	#3837	▼
2010s	464	#2930	▼
2000s	660	#1954	▲
1990s	162	#4607	▲
1980s	15	#8333	—

The Story of Tiernan

A Gen Z name

Peaking in 2007, Tiernan is a name that defines a generation. Boys named Tiernan are most likely born between 1997 and 2017.

How rare is Tiernan?

Only about 1 in every 138,462 babies born in 2024 was named Tiernan — a truly uncommon choice.

The journey through the decades

First appeared in the records in 1985, peaked in the 2000s with 660 births that decade, and has gracefully settled into a quieter chapter.

Tiernan by the numbers

Would fill 30 school buses
Meeting one Tiernan per day would take 4 years

Year-by-Year Data

View complete yearly data(37 years, 1985–2024)

Year-by-year popularity data for the name Tiernan
Year	Births	Rank	Change
2024	26	#4166	-9 (-25.7%)
2023	35	#3404	-3 (-7.9%)
2022	38	#3205	+6 (18.8%)
2021	32	#3570	+12 (60.0%)
2020	20	#4839	-4 (-16.7%)
2019	24	#4319	-4 (-14.3%)
2018	28	#3876	+2 (7.7%)
2017	26	#4095	-10 (-27.8%)
2016	36	#3220	-10 (-21.7%)
2015	46	#2677	-3 (-6.1%)
2014	49	#2540	-4 (-7.5%)
2013	53	#2397	-3 (-5.4%)
2012	56	#2319	-17 (-23.3%)
2011	73	#1923	0
2010	73	#1937	-12 (-14.1%)
2009	85	#1787	+7 (9.0%)
2008	78	#1872	-8 (-9.3%)
2007	86	#1738	+19 (28.4%)
2006	67	#2007	-2 (-2.9%)
2005	69	#1866	+1 (1.5%)

Source: U.S. Social Security Administration. Showing years with 5+ recorded births.

Tiernan as a Girl's Name

Though more common for boys, Tiernan has a notable history as a girl's name too, with 195 births since 1989.

Unranked

Current rank

195

Total births

2002

Peak year

Compare Tiernan as boy vs girl

Frequently Asked Questions

Is Tiernan a boy's or girl's name?

Tiernan is primarily a boy's name. It is also used as a girl's name, with 195 recorded births.

When was Tiernan most popular?

Tiernan reached its peak popularity in 2007 with 86 births that year. It is currently ranked #4166 in the U.S.

How popular is the name Tiernan?

Tiernan is currently ranked #4166 in the U.S. (2024). It has been given to 1,452 babies since 1985.

Can Tiernan be used for both boys and girls?

Yes, Tiernan is used for both boys and girls. As a boy's name, it currently ranks #4166. As a girl's name, it is not currently in the top rankings.

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Data source: U.S. Social Security Administration, 1985–2024