Here's my interpretations:

Squall - Skwall
Zell - Like its spelled
Rinoa - Rih-no-uh
Seifer - Sigh-fur
Raijin - Rye-Shin
Fujin - Foo-Shin
Edea - Eh-day-uh
Ultimecia - Ul-ti-mesh-uh
Irvine - Ur-Veen
Selphie - Sel-fee
Quistis - kwist-is
Quezacotl - Kayz-uh-cot-uhl
Xu - zoo
Esthar - Es-thur
Balamb - Buh-lam