Gracious
Jonavan is a modern American elaboration of the name John, likely influenced by the phonetics of Donovan or Jonathan. It combines the traditional Hebrew roots of John with a contemporary, multi-syllabic structure.
Less common today
Jonavan isn't in the latest US Top 1000. It last peaked at #3,768 in 2007.
US births per 5-year period, 1990βpresent (SSA data).