Amalthea is a very rare girls' name that peaked in 2021 and has grown less common since.
Amalthea is a girl name. In 2025 it ranked #13,304 for girl births in the United States (and #22,196 across all names), given to 6 babies. Amalthea was first reported in SSA data in 2016 and peaked in 2021 (7 births).
Girls named Amalthea per year · hover for count and girls rank · Source: U.S. Social Security Administration, national data 2016–2025 · 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