Kasius is a very rare boys' name that peaked in 2023 and remains in steady use.
Kasius is a boy name. In 2025 it ranked #11,345 for boy births in the United States (and #23,387 across all names), given to 6 babies. Kasius first appears in 2018 and peaked in 2023 (9 births).
Boys named Kasius per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 2018–2025 · U.S.+territories from SSA territory files (1998–2025)