Where does “desayuno” come from?
desayuno (Spanish) comes from Spanish desayunar, from Spanish ayunar, from Vulgar Latin aiunare, from Latin iēiūnō, from Latin iēiūnus, from Latin iaiūnus, from Proto-Italic jagjūnos, from Proto-Indo-European Hyeh₂ǵ-yu- — to sacrifice.
desayuno (Spanish): breakfast
Ancestry of “desayuno”, step by step