There are an estimated 289 people named Riordan alive worldwide today. That ranks Riordan at #22275 globally, with the highest concentrations in United States.
In the United States, Riordan is held by approximately 289 people, ranking #22275 among first names. That works out to roughly 0 per 100,000 Americans (or 1 in 1,148,443 U.S. residents).
Historically Riordan is used overwhelmingly as a male name (100.0% male).
Riordan appears in birth records going back to 1880. Use the chart below to see how its popularity has changed across decades, and the surname section to find common pairings.