Trillian is a very rare name used for both girls and boys that was most common in the 2010s and has all but disappeared.
Trillian is predominantly a girl name. It last appears in U.S. records in 2015. Trillian was first reported in SSA data in 2007 and peaked in 2008 (7 births).
Girls named Trillian per year · hover for count and girls rank · Source: U.S. Social Security Administration, national data 2007–2015 · U.S.+territories from SSA territory files (1998–2015) · 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
Boys named Trillian
Boys named Trillian per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 2007–2015 · U.S.+territories from SSA territory files (1998–2015) · 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