JOE-zef ZY-bul
Here's a breakdown:
* JOE-zef: The "J" is pronounced like the "J" in "joy," and the "ph" is silent.
* ZY-bul: The "ei" sounds like the "i" in "time," and the "b" is pronounced like the "b" in "bat."
The "e" at the end of "Seibel" is silent.