1. As a name:
* See-non: This is the most common pronunciation in English, especially when referring to the character Sinon from the *Sword Art Online* anime and light novels.
2. As a word meaning "synonym":
* Sin-on: This pronunciation is more common in British English and some other parts of the English-speaking world.
3. As a French word:
* See-non: This pronunciation is more common in French.
Ultimately, the best way to pronounce "Sinon" is to consider the context in which it is used.