The Republic of Sudan.
They all have 3 letters, but "red" and "tan" have exactly 3 letters.
The actor and presenter you are referring to is "Matthew Fox." He has a first name with 7 letters and a surname with 3 letters.
Lev Tolstoy (was a Russian novelist)
The Huge star name with 3 and 5 letters is the Red Giant.
Marie Antoinette
ali baba
The first three letters are JON. The last three letters are NES.
tin
No
Boa
The name of a snow runner with three letters could be ski.