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Across the world, Tiernan (Tiernan , Tighearnán, تينان ) is a rare predominantly masculine, but very seldom feminine forename. The given name Tiernan is habitual in Ireland, where it is quite a rare male name, Australia, where it is a rare masculine name, and the United Kingdom. Measured by absolute frequency, it most frequently occurs in Ireland, the United States, and Australia. More prevalently, Tiernan is the last name as well as the forename.
Tiernan is also a name for the fictitious and mythical characters: Tiernan , the musical character in the musical The Pirate Queen by Claude-Michel Schönberg.