Gaulish language
The name Argenteuil is recorded for the first time in a royal charter of 697 as "Argentoialum", from a Latin/Gaulish root "argento" meaning "silver", "silvery", "shiny", perhaps in reference to the gleaming surface of the river Seine, on the banks of which Argenteuil is located, and from a Gaulish language suffix "-ialo" meaning "clearing, glade" or "place of".