Kastiel is a very rare boys' name that peaked in 2021 and has grown less common since.
Kastiel is a boy name. In 2025 it ranked #6,279 for boy births in the United States (and #13,204 across all names), given to 14 babies. Kastiel was first reported in SSA data in 2012 and peaked in 2021 (29 births).
Boys named Kastiel per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 2012–2025 · U.S.+territories from SSA territory files (1998–2025) · SSA publishes a name only in years it was given to at least 5 babies, so a name may have been in use before — or between — the years shown here