Here's a breakdown:
* "G" is silent, like in "gnome" or "gnaw".
* "I" is pronounced like the "ee" in "see".
* "V" is pronounced like the "v" in "victory".
* "E" is pronounced like the "e" in "bed".
* "R" is pronounced like the "r" in "road".
* "N" is pronounced like the "n" in "knee".
* "Y" is pronounced like the "ee" in "see".
So, the emphasis is on the first syllable, "zhee", and the pronunciation is zhee-ver-nee.