// Workers AI · dad joke modeWhat did Tiernan's cat say? Purr-nan.

Tiernan (Irish: MacTiarnaigh or Ó Tiarnáin; also spelled Tirnan, Tierney) is an Irish surname. Tiernan is also an anglicisation of Tiarnán, a given name derived from the Irish word tiarna "lord" + -án (diminutive suffix).

As surname

Notable people with the surname Tiernan include:

• Andrew Tiernan (born 1965), English actor
• Bob Tiernan, American politician
• Caleb Tiernan (born 2003), American football player
• Cate Tiernan (born 1961), pen name of Gabrielle Charbonnet, American author
• Dan Tiernan (born 1996), English stand-up comedian
• Fergus Tiernan (born 1982), Scottish football midfielder
• Frances Christine Fisher Tiernan (1846–1920), pen name "Christian Reid", American novelist, author
• Greg Tiernan (born 1965), Irish-born-Canadian-based animator, director, voice actor
• Jonathan Tiernan-Locke (born 1984), British cyclist
• Mary Spear Nicholas Tiernan (1835–1891), American writer
• Mike Tiernan (1867–1918), American professional baseball player
• Patrick Tiernan (born 1994), Australian runner
• Robert Tiernan (1929–2014), American lawyer, politician
• Sonja Tiernan, Irish historian
• Tommy Tiernan (born 1969), Irish comedian, actor, writer, presenter

As forename

Notable people with the forename Tiernan include:

• Tiernan Brady, Irish-Australian LGBT rights campaigner
• Tiernan Killeen (born 2003), Irish hurler
• Tiernan McCann (born 1991), Irish Gaelic footballer
• Tiernan O'Halloran (born 1991), Irish rugby player

See also

• McKiernan Clan
• McKernan (surname)
• Tiernan, Oregon, named for R. Tiernan
• McKiernan
• McTiernan
• McTernan
• Kiernan
• Kernan (disambiguation)