The Seychelles, officially named the Republic of the Seychelles is an island country consisting of 115 islands in the Indian Ocean. The islands were uninhabited until the 16th century with the British and French competing for domination. It eventually came under British control. However, while English, French and Seychellois Creole are the official languages of the area, French is predominant and Seychellois Creole is mostly based on French. This entails that the proper pronunciation of Seychelles derives from French. Furthermore, the name Seychelles derives from Louis XV's Minister of Finane's name, Jean Moreau de Séchelles.
Therefore, the correct pronunciation of Seychelles in French is Say-shell. It is important to note that the pronunciation of the final double "L" must be stressed and the sound slightly elongated.