Octoroon n. : The offspring of a quadroon and a white person; a mestee.

Example:
Does anyone know the appearance of a first generation Octoroon ?

Taxonomy
quadroon, octoroon, ancestry, mulatto, proportion, quintroon, African ancestry, grandparents, great-grandparents, free encyclopedia, mixed-race, one-eighth, Latin, one-quarter, century southern, ancestors, black and white, hexadecaroon.

Defination from the web:
octoroon and, more rarely, quintroon were historically racial categories of hypodescent used to describe proportion of African ancestry ... In the James Bond novel The Man With The Golden Gun, the character of Tiffy is described as an attractive octoroon. ...