Its source is Liliana, an Italian name meaning "Lily."
The name Lilliana ranked 891st in popularity for females of all ages in a sample of 2000-2003 Social Security Administration statistics and 3951st in popularity for females of all ages in a sample of the 1990 US Census.
Though this name appears on the 1990 U.S. Census lists, it is used by only a small percentage of the general population.
Some authorities believe this name originated as a nickname of Elizabeth. The same is said of the English Lily, which did not appear as a formal name until the 19th century.