If we go by the /dance rule to determine races we get the following:

Human Male: White American.
Human Female: Multiple dancers did the Macarena in the video so tough to say.

Orc Male: African American.
Orc Female: African American.

Dwarf Male: Russian.
Dwarf Female: Irish.

Troll Male: Brazilian.
Troll Female: African American.

Night Elf Male: African American (lightskinned).
Night Elf Female: French.

Tauren Male: Fruit.
Tauren Female: African American.

Gnome Male: Jewish American.
Gnome Female: African American.