Really bored, so i decided to share where i think the inspiration for all the races come from...
Night Elf: Chinese
Tauren: Native American
Troll: South American/Carribean
Dwarf: Scottish
Orc: African
Dranei: Russian/possibly middle eastern?
Humans: American
Blood Elfs: British<---unsure, help me out!
Gnome: European<---unsure, help me out!
These are just my opinions, i back them up with the the building styles and the way they talk.