Meaning and history
Tiernan is the anglicized form of Tighearnán.
20062006: 67 births, rank #1,994
2007: 86 births, rank #1,728
2008: 78 births, rank #1,861
2009: 85 births, rank #1,774
2010: 73 births, rank #1,924
20112011: 73 births, rank #1,905
2012: 56 births, rank #2,292
2013: 53 births, rank #2,364
2014: 49 births, rank #2,516
2015: 46 births, rank #2,641
20162016: 36 births, rank #3,161
2017: 26 births, rank #3,993
2018: 28 births, rank #3,793
2019: 24 births, rank #4,230
2020: 20 births, rank #4,698
20212021: 32 births, rank #3,497
2022: 38 births, rank #3,151
2023: 35 births, rank #3,347
2024: 26 births, rank #4,072
20252025: 29 births, rank #3,757
In 2025, 29 babies were recorded with the name Tiernan, ranking #3,757 among boys.