God has heard; thankful
Jdyn is a modern creative spelling of Jaden, which is likely derived from the biblical name Jadon. It is often interpreted as meaning 'thankful' or 'he will judge' in Hebrew contexts. This specific four-letter spelling is a contemporary American invention.
Less common today
Jdyn isn't in the latest US Top 1000. It last peaked at #5,425 in 2007.
US births per 5-year period, 1990βpresent (SSA data).