Tiernan, of Irish origin, is an unusual and distinctive given name for boys. Derived from the Irish surname Ó Tiegh, which was anglicized to Tierney, it means 'descendant of Tighe', a personal name meaning 'fierce'. The name has gained popularity in recent years due to its unique sound and spelling, making it a notable choice for parents seeking an uncommon yet meaningful name for their son.
The name Tiernan experienced significant popularity from the late 1980s to around 2007, with a peak of 86 births in 2007. However, it has since seen a decline, with only 35 births recorded in 2023. Overall, there have been 1426 babies named Tiernan from 1985 to 2023.