Erwin appears in U.S. registration data going all the way back to 1880, when records begin. Its popularity climbed over the following decades. In 1918, 512 babies received the name (ranked #233). Today it sits well outside the top 1,000 (around #2544), with roughly 51 babies named Erwin each year. Erwin's usage has held roughly steady recently. In total, around 21,202 babies have been registered with this name since 1880.