Son of Jack
A modern creative spelling of Jackson, which originated as an English surname meaning 'son of Jack'. The name Jack itself is a diminutive of John, ultimately derived from the Hebrew name Yochanan meaning 'God is gracious'.
Less common today
Jaxsyn isn't in the latest US Top 1000. It last peaked at #1,909 in 2015.
US births per 5-year period, 1990βpresent (SSA data).