Lily; a symbol of purity
Lillianna is an expanded, more decorative version of the name Lillian. It combines the classic floral name Lily with the popular 'anna' suffix, resulting in a more melodic, four-syllable sound. Historically, the lily flower has been used to represent innocence and purity in various cultures.
Less common today
Lillianna isn't in the latest US Top 1000. It last peaked at #694 in 2011.
US births per 5-year period, 1990βpresent (SSA data).