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Kiernan

♂ Boy

Pronounced KEER-nan /ˈkɪər.nən/High

Meaning: Anglicized form of the Irish surname Ó Ciarnaigh, meaning 'descendant of Ciarán,' from Gaelic ciar meaning 'dark' or 'black'High

In 30 seconds: An Irish surname-turned-first-name derived from Ciarán, meaning 'little dark one.' It has a strong Celtic feel with a modern surname-style edge.
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Origin HighIrish
MeaningAnglicized form of the Irish surname Ó Ciarnaigh, meaning 'descendant of Ciarán,' from Gaelic ciar meaning 'dark' or 'black'
U.S. rank (2024)#3119 ↗ Rising
2024 U.S. births39 boys (0.00% of U.S. boys)
Peak year2008
Total births (all-time)≈ 1,727

Popularity in the U.S. · SSA data

peak 200819572024

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

History & Origin

Kiernan originates as an Irish patronymic surname, Ó Ciarnaigh, meaning 'descendant of Ciarán.' The personal name Ciarán combines ciar ('dark,' 'black') with the diminutive suffix -án, yielding 'little dark one.' The Kiernan clan was prominent in counties Cavan and Meath.

As a given name, Kiernan follows the broader trend of transferring Irish surnames to first-name use. It remains relatively rare, giving it a distinctive quality. Canadian actress Kiernan Shipka has brought the spelling to wider attention in the 21st century.

Did you know? The name shares its root with Ciarán, borne by two major Irish saints — St. Ciarán of Clonmacnoise and St. Ciarán of Saighir — making it deeply embedded in Irish Christian heritage.
Overall data confidence 87%
Behind the Name — Kiernan — Irish surname origin, Ciarán rootMacLysaght, Edward — The Surnames of Ireland — Ó Ciarnaigh clan history

Variations

KieranCiaranCiaránKiernan

Nicknames

Kier

Famous Bearers

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If you like Kiernan…

Kieran— the direct root first name sharing the same Gaelic ciar origin
Cormac— Irish Gaelic name with strong clan heritage
Declan— popular Irish saint name with the same surname-style crossover appeal
Ronan— Irish Gaelic name with similar two-syllable rhythm

Frequently Asked

What does the name Kiernan mean?

Kiernan means 'descendant of Ciarán,' from the Irish Gaelic ciar meaning 'dark' or 'black.'

How do you pronounce Kiernan?

Kiernan is pronounced KEER-nan (/ˈkɪər.nən/), with two syllables and stress on the first.

Is Kiernan a boy or girl name?

Kiernan is used for both boys and girls, though it remains more commonly given to girls in recent years via actress Kiernan Shipka.

How popular is Kiernan?

Kiernan is a rare given name, making it a distinctive choice for parents who love Irish heritage names.