Demii is a very rare variant of Demi that peaked in 2022 and remains in steady use.
Demii is a girl name. In 2025 it ranked #12,229 for girl births in the United States (and #20,510 across all names), given to 7 babies. Demii was first reported in SSA data in 2010 and peaked in 2022 (15 births).
Girls named Demii per year · hover for count and girls rank · Source: U.S. Social Security Administration, national data 2010–2025 · 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