Over the past 110 years, 111 241 boys and 5 girls have been named Josiah. The name Josiah ranks 261th in the United States among the most common names for boys. For the first time more than ten times newborns were named Josiah in 1912. The peak of popularity of the name Josiah 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.