The story
- Proto-Indo-European*ḱers-
- Proto-Indo-European*ḱr̥séti
- Proto-Italic*korsō
- Latincurrō
- Latincurrēns
- Medieval Latincurrentia
- English todaycurrency
Borrowed from Medieval Latin currentia. By surface analysis, current + -cy.
Etymology from Wiktionary, CC BY-SA 4.0.