Invented name, likely a blend of Vanessa and Fantasia.
Vantasia is a modern American coinage, likely created by combining the prefix of Vanessa with the suffix of Fantasia. It evokes a sense of imagination and whimsy, though it lacks a singular historical etymology.
Less common today
Vantasia isn't in the latest US Top 1000. It last peaked at #9,394 in 1995.
US births per 5-year period, 1990βpresent (SSA data).