God has answered
Elliannah is a modern American elaboration of Eliana. It is derived from the Hebrew name Eliyanah, which combines 'el' (God) and 'anah' (answered), though it is often associated with the Latin 'Aeliana' meaning sun.
Less common today
Elliannah isn't in the latest US Top 1000. It last peaked at #8,017 in 2014.
US births per 5-year period, 1990βpresent (SSA data).