Tiernan
Below 5 births
2025 SSA
About Tiernan
Tiernan is the slightly edgier and sharper cousin of Kiernan. This is one Irish surname that is attractive but distinctive; Tierney is another, related, option.
Tiernan for boys#3840 US
Tiernan was a popular name in early and medieval Ireland and was borne by several kings and saints. It is currently high on the list in Northern Ireland.
Tiernan for girls
An old Irish surname cousin of Tierney that makes an unusual and appealing Irish gender switch.
Pronounced TEER-nun.
As of October 2026, Tiernan ranked #3840 for boys in US births in 2025 and #17917 for girls in US births in 2018 SSA, peaked at #1738 for boys in 2007 and #6114 for girls in 2002.
Popularity & trends
Data table
| Year | US rank | Births | Per million |
|---|---|---|---|
| 2014 | #2,540 | 49 | 25.5 |
| 2015 | #2,677 | 46 | 24 |
| 2016 | #3,220 | 36 | 19 |
| 2017 | #4,095 | 26 | 14 |
| 2018 | #3,876 | 28 | 15.4 |
| 2019 | #4,319 | 24 | 13.4 |
| 2020 | #4,839 | 20 | 11.6 |
| 2021 | #3,570 | 32 | 18.3 |
| 2022 | #3,205 | 38 | 21.8 |
| 2023 | #3,404 | 35 | 20.5 |
| 2024 | #4,166 | 26 | 15.1 |
| 2025 | #3,840 | 29 | 17 |
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Tiernan on lists
Famous Tiernans
- Tiernan O'Rourke (Tigernan Ua Ruairc)Boy
12th century Irish king of Breifne
- Tiernan O'HalloranBoy
Irish rugby player