Defender of mankind
Lexxi is a modern diminutive form of Alexandra. It ultimately derives from the Greek name Alexandros, which combines 'alexein' (to defend) and 'aner' (man).
Less common today
Lexxi isn't in the latest US Top 1000. It last peaked at #5,920 in 2010.
US births per 5-year period, 1990βpresent (SSA data).