Etymology tree Proto-Indo-European *ḱers- Proto-Indo-European *-éti Proto-Indo-European *ḱr̥séti Proto-Italic *korzō Latin currō Latin currēns Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -ia Medieval Latin currentiabor. English currency Borrowed from Medieval Latin currentia, from Latin currēns, from currō. By surface analysis, current + -cy.