Fewer than five US boys were named Lon in 2025, so it does not appear in that year’s SSA list for boys. Its best rank for boys was #193, reached in 1880. The most boys given the name in a single year was 274, in 1948. For comparison, it was #9,242 in 2015 and #434 in 1950.
Social Security card records list Lon in 137 years of the 146 from 1880 to 2025, starting in 1880 with 64 babies. In all, 9,856 US babies have been given the name, 0.2% of them girls and 99.7% boys. Its busiest decade was the 1950s, with 2,401 babies named Lon.
Over the 10 years from 2016 to 2025, 39 US boys were named Lon; the busiest of those years was 2016, with 10.
Related spellings in the SSA files include Lonnie (101,481 babies since 1880), Alonzo (46,109 babies since 1880) and Luan (1,622 babies since 1880). Rarer spellings such as Lohan, Lonne and Loen are summarised on this page.