Over the past 110 years, 12 291 boys have been named Knox. The name Knox ranks 874th in the United States among the most common names for boys. For the first time more than ten times newborns were named Knox in 1916. The peak of popularity of the name Knox came in the 2000s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.