Yes.
No, they usually aren't.
Paul White - American football - was born in 1922.
Yes one biracial African-american tennis player is James Blake who is half white half black. A plain African-American tennis male is Donald Young.
African American
Steve White - American football - was born on 1973-10-25.
Leon White - American football - was born on 1963-10-04.
Jason White - American football - was born on 1980-06-19.
Jordan White - American football - was born on 1988-06-04.
Johnny White - American football - was born on 1988-02-03.
Mike White - American football - was born on 1936-01-04.
Gene White - American football - was born on 1932-06-21.
Hugh White - American football - died on 1936-06-11.