Saadia (Hebrew: סעדיה) is a Hebrew and Arabic given name. According to some classical rabbinical sources, the name derives from the Hebrew verb Sa'ad (Hebrew: סעד, support), and means "supported god". However, according to researchers at the Wissenschaft des Judentums, it is a form of artificially Hebrew-Arabic name Sa'id (Happy سعيد). It is indeed common that Saadia speaking countries are also known as Sa'id.

Saadia Gaon, which seems to be the first to bringing this prénom2, and is also often referred to by the mere mention of "Saadia," without further explanation, sign 'Sa'id ben Yosef "at the beginning of his career, but then designate by the name of "Saadyahou" (סעדיהו) in his Sefer haGalouï; Moses ibn Ezra also notes the Sa'adel form (סעדאל).