10th cent. Vulgar Latin de (Peregrinatio, 4th cent.) (Already assuming the roles of ab "by" and ex "out of" in Classical Latin). From Latin de "of."
From Proto-Italic *dē 'id.' From Proto-Indo-European *deh1- "by means of (this) here," instrumental of *de "here."
Asturian de, Portuguese de, Galician de, Catalan de, French de, Italian di, Eastern Vuglar Latin Aromanian di, Romanian de
Oscan dat, Umbrian da-, Faliscian de (borrowed from Latin?)
Old Irish de, Old Welsh di
Old High German zuo "to," Old Saxon tō 'id.,' English to
Ancient Greek δή (dé) "even"