Meaning and history
From the Irish surname Ó Ceallacháin, the Anglicized form of which is derived from the given name Cellachán.
20062006: 35 births, rank #3,083
2007: 28 births, rank #3,687
2008: 41 births, rank #2,879
2009: 42 births, rank #2,847
2010: 43 births, rank #2,787
20112011: 37 births, rank #3,046
2012: 47 births, rank #2,594
2013: 57 births, rank #2,250
2014: 77 births, rank #1,884
2015: 83 births, rank #1,804
20162016: 115 births, rank #1,484
2017: 166 births, rank #1,141
2018: 200 births, rank #1,026
2019: 244 births, rank #897
2020: 288 births, rank #806
20212021: 410 births, rank #660
2022: 571 births, rank #519
2023: 665 births, rank #461
2024: 908 births, rank #364
20252025: 1,566 births, rank #227
Callahan rose from #364 to #227 for boys between 2024 and 2025. That year also produced its highest recorded birth count, at 1,566.