As a currency:
* Mandarin: "yoo-ahn" (like "you" followed by "ahn" as in "ant")
* Cantonese: "yun" (like "yun" in "yummy")
As a unit of length:
* Mandarin: "yuan" (like "won" in "won't")
* Cantonese: "yun" (like "yun" in "yummy")
As a word meaning "source" or "origin":
* Mandarin: "yuan" (like "won" in "won't")
* Cantonese: "yun" (like "yun" in "yummy")
In most cases, the pronunciation "yoo-ahn" for the currency is the most common and widely understood.