Knox is a Scottish surname from the Gaelic cnoc and means "hill" or "round hill". Reformer John Knox and Fort Knox, home of the US gold reserve, give it a solid, no-nonsense sound, and Brad Pitt and Angelina Jolie chose it for their son in 2008. Knox entered the US top 1000 for boys in 2009, right after that birth, and has climbed from number 258 in 2015 to number 196 in 2025, its best rank so far.