The only free and comprehensive online etymological dictionary of the Spanish language
aquí (Adverb) "here;" (uncommon) "since"
12th cent. From Vulgar Latin *accu hic, from Latin eccum hic "this here." For a continued etymology of eccum "this," see acá
Distinct from acá "hither," especially in Latin American dialects.
Indo-European
Romance
Asturian equí, Portuguese aqui, Galician aquí, Catalan aquí, French ici (< ecce hic), Romanian aci
Italic
Oscan ek, ekúk, Paelignian ecuc, Umbrian eso (< *eko). In Italic languages, *eke and its variants became inflected pronouns while they remained unchanged in Latin until late.