Gracious
Jonika is a modern feminine elaboration of John or Joan, likely influenced by the Slavic name Janika or the Scandinavian Jonica. It combines the traditional Hebrew root meaning 'God is gracious' with a rhythmic, contemporary suffix.
Less common today
Jonika isn't in the latest US Top 1000. It last peaked at #7,328 in 1992.
US births per 5-year period, 1990βpresent (SSA data).