Knox peaked in 2022 at rank 209, where it now sits in 2024. The total American count of 22,294 is concentrated almost entirely in the last fifteen years. Knox is one of the cleanest examples of a Scottish surname that crossed into first-name use through celebrity adoption and stayed because the sound profile happened to align with broader naming trends already underway in American chart territory.
A Scottish placename root
Knox descends from Scottish Gaelic cnoc, meaning "hill" or "round mound," which became a placename element in southwestern Scotland and then a surname for families from those locations. The most historically significant bearer is John Knox (c. 1514-1572), the Scottish Reformation theologian whose presence in Edinburgh shaped Scottish Presbyterianism and English-language religious history. For most of subsequent history, Knox was firmly a surname rather than a first name.
Fort Knox in Kentucky (named after Henry Knox, Revolutionary War general and first U.S. Secretary of War) gave the name a heavy-vault association in American English. The phrase "safe as Fort Knox" became idiomatic during the 20th century. That association works for or against the name depending on temperament; some parents read it as solid and reliable, others as joke-prone and gimmicky.
What pushed it across the line
Angelina Jolie and Brad Pitt's son Knox Leon was born in 2008. The celebrity-baby effect on naming is sometimes overstated, but in this case the SSA chart shows a clear inflection point. Knox went from negligible use to chart presence within a few years of the announcement. The 2010s climb sustained because Knox happened to fit the surname-as-first-name aesthetic that was already underway with Maddox and Beckett, both of which had been climbing in the same window.
The K opening, single-syllable structure, and X ending give Knox the kind of phonetic compactness that 2010s-2020s parents have favored across multiple naming traditions. Nash shares this aesthetic of clipped consonant punch.
The counter-reading
The honest concern with Knox is the celebrity-trail problem. A name that climbed because of a Brangelina baby announcement carries a faint cohort marker for as long as the public memory of that announcement persists. Whether that fades into invisibility or sticks depends on how Knox performs across the next decade. Parents picking the name today are simultaneously inheriting the 2008 announcement and hoping its specificity fades. The four-letter boy names list places Knox in context.