* NY: Pronounced like the "ny" in "canyon" or "onion".
* AN: Pronounced like the "an" in "fan" or "plan".
* SA: Pronounced like the "sa" in "saw" or "salad".
* PO: Pronounced like the "po" in "pole" or "hope".
Therefore, the pronunciation of "NYANSAPO" is roughly:
ny-an-sa-po
Important Note: The "s" sound in "SA" is a bit softer than the English "s," and the "po" at the end can sound slightly more drawn out than in English.
It's always best to try to listen to a native speaker if you can!