The name translates into English as " lily flower", and the symbol is in fact a stylized Iris
Pseudacorus I . . It was adopted by King Philip I of France in the 11th century. His grandson Louis VII was the first to adopt the Azure semé-de-lys Or (a blue shield with a tight pattern of small golden fleur-de-lis) as his badge, and this came to be so closely associated with his country that it is now known as "France Ancient". Three gold flowers on a blue background ("France Modern") dates to 1376 and Charles V of France.
The fleur-de-lis' origins with French monarchs stems from the baptismal lily used in the crowning of King Clovis I. To further enhance its mystique, a legend eventually sprang up that a vial of oil descended from heaven to anoint and sanctify Clovis as King. The thus "anointed" Kings of France later maintained that their authority was directly from God, without the mediation of either the Emperor or the Pope. Other legends claim that even the lily itself appeared at the baptismal ceremony as a gift of blessing in an apparition of the Blessed Virgin Mary. The Catholic Church later endorsed the legend by associating Mary with the symbol.