There are no countries that have only 3 letters in their name.
car
3-Ohio,Iowa and Utah
BSA is one.
Awl
The only countries with three letters in their name are Fiji and Vanuatu.
47, all of them except Iowa, Ohio, and Utah. If you mean how many have exactly 5 letters in their names, then it is 3: Idaho, Maine, and Texas.
The only scottish port with 3 letters in AYR. This is a common question found is crossword puzzles.
Barbara
Elx is a city in Spain
Laos (Lao People's Democratic Republic)
A snake with a three letter name is a Boa