My God is Yahweh
Elliah is a variant of the Hebrew name Elijah or Eliana. It combines the elements 'El', meaning God, and 'Yah', referring to the tetragrammaton, resulting in a meaning of 'Jehovah is my God'. While rare in this specific spelling, it follows the popular trend of 'El-' names for girls.
Less common today
Elliah isn't in the latest US Top 1000. It last peaked at #9,585 in 2018.
US births per 5-year period, 1990βpresent (SSA data).