Roo-eez
The "z" sound is like the "s" in "rose" or "maze".
However, it's important to note that the pronunciation can vary depending on the speaker's origin and personal preference. Some people might pronounce it as:
* Rwee-z (emphasizing the "ee" sound)
* Rwiz (with a more "z" sound)
If you're unsure about the specific pronunciation, it's always best to ask the person how they pronounce their name.