Pearl
Pessy is a Yiddish diminutive form of the name Batya or Pessel, which ultimately derives from the Greek word for pearl. It has long been used within Jewish communities as a sweet, informal variation of more traditional Hebrew names.
Less common today
Pessy isn't in the latest US Top 1000. It last peaked at #2,699 in 2020.
US births per 5-year period, 1990βpresent (SSA data).