i don't know but im sure you could go to freetranslations.com and type guatemalans in English to spanish and figure it out.
spanish
A person from Guatemala is known as a Guatemalan.
guatemaltecos
Chapines
If you are from Guatemala, you are Guatemalan. If you are born in the US, you are an American.
Guatemala
The Guatemalan people refer to themselves as Guatemaltecos.
There is almost 0% African Population in Guatemala, most people is of spanish descent.
Guatemala City
Ciudad Guatemala
I bring you greetings from Guatemala
Ciudad de Guatemala