Jemma is the English phonetic spelling of Gemma, the Italian word for "gem" or "precious stone", a medieval name borne by Gemma Donati, the wife of Dante. The J spelling became popular in Britain and Australia in the 1980s and brings the name closer to Emma and Jenna. Jemma entered the US top 1000 in 2010, peaked at number 528 in 2018 and ranks number 866 among girls in 2025.