In 2025, 20 US boys were named Brennen, making it the 4,882nd most common boys’ name of the year, down 1,259 places from #3,623 in 2024. That is 11 fewer than the 31 boys named Brennen in 2024. Its best rank for boys was #534, reached in 1998. The most boys given the name in a single year was 455, in 2009. For comparison, it was #1,261 in 2015 and unranked in 1950.
Social Security card records list Brennen in 62 years of the 146 from 1880 to 2025, starting in 1962 with 6 babies. In all, 9,217 US babies have been given the name, 1.9% of them girls and 98% boys. Its busiest decade was the 2000s, with 3,744 babies named Brennen.
Over the 10 years from 2016 to 2025, 587 US boys were named Brennen; the busiest of those years was 2016, with 126. In 2025 that was about 1 in 85,404 of the boys in SSA’s list for the year.
Related spellings in the SSA files include Brennan (35,487 babies since 1880) and Brennon (4,382 babies since 1880).