Just, upright, or righteous
Jesstin is a modern creative spelling of Justin. It derives from the Latin name Justinus, which is a derivative of Justus, meaning equitable or fair. While the traditional spelling is ancient, this specific variation is a contemporary American invention.
Less common today
Jesstin isn't in the latest US Top 1000. It last peaked at #6,911 in 2005.
US births per 5-year period, 1990βpresent (SSA data).