This is a good site to get that information: http://boston.redsox.mlb.com/bos/fan_forum/newsletters.jsp
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what is french guiana ethnic background of the population
Rihanna's background is Barbadian
Justin Timberlake's ethnic background is of English (Anglo-American) ancestry.
african -american
Islam is ethnic to an extent. Those who choose to convert to it are recognized as full adherents, whatever their ethnic background.
slavic
maybe ethnic background.
mixed
The word "ethnic" refers to an individual of a particular ethnic background or nationality. A phrase that can be used to define ethnic is "a collective of people who identify with the same background or cultural heritage."
Pilar Sanders is reported to have a mixed ethnic background of both African-American and Filipina.