Pippin.
There hasn't been one with three letters beginning in u and ending in n.
Treen!
Anden, Allen, Alden, Anton, Avery...
Nim
keenkinkingpin
tantakententensiontendonteenthinthenthantintontalontokentoboggantreasontractiontrainteaspoontablespoontoxintaverntakentoughen
Cyan and Crimson.
movie stars whose last name starts with C and ends with N: * James Caan * Michael Cain
There are no countries that both begin and end with the letter N.
Neither.
nyala
bean