Jaci is a short form of Jacqueline, the French feminine of Jacques, which goes back to the Hebrew Jacob and means "supplanter" or "holder of the heel"; it can also stand for Jacinta, the Spanish form of Hyacinth. It is a cousin of Jacey and Jaycee and shares their friendly, casual sound. Jaci stood at number 1385 in 2000, peaked at number 1075 in 2005 and stands at number 2912 in 2025 with 58 births.