Costello is a very rare boys' name that peaked in 1951 and has since faded.
Costello is predominantly a boy name. In 2025 it ranked #10,940 for boy births in the United States (and #22,588 across all names), given to 6 babies. Costello first appears in 1931 and peaked in 1951 (11 births).
Boys named Costello per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 1931–2025 · U.S.+territories from SSA territory files (1998–2025)
Girls named Costello
Girls named Costello per year · hover for count and girls rank · Source: U.S. Social Security Administration, national data 1931–2025 · U.S.+territories from SSA territory files (1998–2025)