The word some Jamaicans use to refer to Jamaicans (when speaking about nationality) are as follows:

Jamaican (of course! this one is obvious)

Jamaicans (plural)

yaadie (singular / plural) – word used by some Jamaicans to refer to themselves, another Jamaican or other Jamaicans. It can be used in the plural or the singular.

yaadie dem …. (plural) – used to refer to more than one Jamaican and “yaadie dem” should be used in a sentence. It will sound strange if someone just says “yaadie dem” and nothing else because it is used in sentences.