Probably "Lee". At least in French it would be pronounced that way, Fleur de Lys. (flur de lee) Here it suggests you should pronounce the s: https://dictionar

Probably "Lee". At least in French it would be pronounced that way, Fleur de Lys. (flur de lee) Here it suggests you should pronounce the s: https://dictionary.cambridge.org/us/pronunciation/english/fleur-de-lis https://dictionary.cambridge.org/us/pronunciation/english/fl...