God has answered
Elliahna is a modern American elaboration of Eliana. It is rooted in the Hebrew name Eliyanah, which combines elements meaning 'my God' and 'has answered'. This spelling variant adds an extra 'h' and 'a' for a more decorative, phonetic flourish.
Less common today
Elliahna isn't in the latest US Top 1000. It last peaked at #9,307 in 2016.
US births per 5-year period, 1990βpresent (SSA data).