As you all know when a Japanese games if being translated into English they change some of the names. Here are some of the name changes for Espers that have been posted on the official website:

Shumihaza -- Shemhazai
Hashmalim -- Hashmal
Cuchrain -- Cúchulainn
Zelhera -- Zalera
Zodiac -- Zodiark

Also on the Official website they have put some info the official EU voice actors on:

Vaan -- Bobby Edner.....
Penelo -- Cat Taber
Basch -- Keith Ferguson
Ashe -- Kari Wahlgren
Balthier -- Gideon Emery
Fran -- Nichole Fantl