first name
BRENNAN
of 53,615 first names recorded in the 2020 Census
Of the 31,223 people named Brennan, 82% reported their origin as White, 5.6% as two or more races and 5.5% as Hispanic or Latino. 93.8% are male. These count how people described themselves on the 2020 Census, not where the name comes from.
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Brennan peaked in 2009, when 1,550 babies got the name.
At least 35,487 babies have been given the name since 1916. Years SSA withheld, because fewer than 5 were born, are skipped rather than drawn as zero. * 2025 is the newest year published and it undercounts: a card application is filed some time after a birth.
Brennan by decade
Among all names given to American babies, its best decade was the 2000s, when it ranked #533. The largest share of babies named Brennan, 54.7%, were born between 1997 and 2012, as Generation Z.
Rank counts both sexes together, among every name SSA recorded that decade; the number under it is births. The 2020s run only to 2025. Generation years follow Pew Research Center, which has not named a generation after 2012.
Where Brennan is most common
Compared with all babies born in each state since 1910, Brennan has been most common in Louisiana (3.4×), Hawaii (2.1×), and Utah (2×), and least common in North Dakota (0.29×).
31,096 births recorded by state, 1910–2025. 2× means twice as common as nationally. States with fewer than 30 such births are left blank, and SSA withholds any year with fewer than 5 in a state, so small states read low.
Either side of Brennan
Spelled almost the same
8 first names in the 2020 Census spelled within a letter or two of Brennan, most common first.
Also a last name
As a last name, Brennan ranks #697 of 156,621, with 47,806 people. See Brennan as a last name
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🔎 BRENNAN 🟦🟦🟦🟦🟦🟦🟦⬜⬜⬜ 1 in 9,673 Americans Rarer than 72.8% of us Peaked in 2009 with 1,550 babies Beat that 👇 https://howrareismy.name/first/brennan/