ROH-zen-kah-vah-lee-ayr
Here's a breakdown:
* ROH: Like the word "row"
* zen: Like the word "zen"
* kah: Like the word "car"
* vah: Like the word "va" in "vacation"
* lee: Like the word "lee"
* ayr: Like the word "air"
It's important to note that the "k" in "kavalier" is silent.