Fewer than five US girls were named Alexius in 2025, so it does not appear in that year’s SSA list for girls. Its best rank for girls was #1,406, reached in 1997. The most girls given the name in a single year was 121, in 1998. For comparison, it was #13,083 in 2015 and unranked in 1950.
Social Security card records list Alexius in 44 years of the 146 from 1880 to 2025, starting in 1928 with 6 babies. In all, 1,650 US babies have been given the name, 92% of them girls and 8.2% boys. Its busiest decade was the 1990s, with 789 babies named Alexius.
Over the 10 years from 2016 to 2025, 13 US girls were named Alexius; the busiest of those years was 2017, with 8.
Related spellings in the SSA files include Alessio (2,372 babies since 1880), Alexis (412,632 babies since 1880), Alexus (18,875 babies since 1880) and Alexys (4,544 babies since 1880).