Etymology tree Latin flōrens Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -ia Latin Flōrentia Proto-Indo-European *-nós Proto-Indo-European *-iHnos Proto-Italic *-īnos Latin -īnus Latin Flōrentīnus Middle French Florentin French Florentin Inherited from Middle French Florentin, from Latin Flōrentīnus, from Flōrentia (“Florence”) + -īnus.