DA: Det er ikke denne bro der har givet navn til stedet, men flere kilder skriver: "Navnet Fladbro kan være afledt af det oldnordiske ord floen – stedet blev en tid kaldt Flobro (Flodebrouff). Floen hentyder til et sted med grundet vand eller mange oversvømmelser. Den landskabelige situation i området, hvor Nørreådalen indsnævrer sig ved Fladbro, har gjort stedet velegnet som vadested. Hvornår der blev bygget bro over åen vides ikke, men der nævnes en bro i offentlige regnskaber i 1586."
EN: It is not this bridge that gave its name to the place, but several sources writes: "The name Fladbro can be derived from the Old Norse word floen - the place was a time called Flobro (Flodebrouff). Floen alludes to a place with shallow water or many floods. The landscape situation in the area where Nørreådalen narrows at Fladbro, has made the place suitable as ford. When there was built a bridge over the creek is not known, but there is mentioned a bridge in public accounting in 1586"