God has given
Joanthan is a rare spelling variant of the Hebrew name Jonathan. It is derived from the Hebrew name Yehonatan, meaning 'Yahweh has given' or 'gift of God.' While the standard spelling is a staple of English-speaking cultures, this specific transposition of the 'a' and 'n' is often considered a modern creative variation or a phonetic spelling.
Less common today
Joanthan isn't in the latest US Top 1000. It last peaked at #3,009 in 1990.
US births per 5-year period, 1990βpresent (SSA data).