Gracious; white wave
Jenessy is a modern American invention, likely created as a phonetic blend of the classic Jane or Jennifer with the rhythmic ending of names like Genesis or Hennessy. While it lacks a singular ancient root, it carries the 'God is gracious' sentiment of the John family of names and the 'white wave' imagery of Jennifer. It is chosen by parents seeking a familiar sound in a unique, rare package.
Less common today
Jenessy isn't in the latest US Top 1000. It last peaked at #11,087 in 2009.
US births per 5-year period, 1990βpresent (SSA data).