Russia.
nation
Both Canada and Mexico have six letters.
Countries with six letters include Belize, Angola, Canada, and France.
Athena was a goddess that had six letters in her name. She was the goddess of wisdom and war.
An Italian pasta with six letters is rotini.
Ronald Reagan, but if you're looking for the same answer I am, that's not the one.
Athena
rhesus
Saturn
January, February, August {it has six letters exactly}, September, October, November, and December.
Assuming you mean exactly six letters - there are three English-language day names with six letters - Monday, Friday, Sunday.