Hieronymi is a surname. Notable people with this surname include:
Károly Hieronymi (1836–1911), Hungarian engineer and politician Pamela Hieronymi, American philosopher and moral psychologist Ruth Hieronymi (1947–2025), German politician
See also Hieronyma, a genus in the plant family Phyllanthaceae Hieronymites, a Catholic cloistered religious order Hieronymus, a name of Ancient Greek origin