Oof...wrong continent hurts for sure.
There are a lot of Guinea's/Guyana's.
Helps to know the origin of them. Not lecturing just adding some interesting stuff (I think). As a geogrpahy buff I look into this stuff for fun.
Guinea is actually a reference to West African people that is really quite offensive in origin.
So Guinea, Guinea-Bissau and Equatorial Guinea reference their location generally in W Africa and equatorial differentiates that one from the other two its right at the crux of the bend of the west coast and on the equator..
Papua New Guinea in SE Asia though was "discovered" by a Spaniard who thought the indigenous people looked like west Africans hence the name. The western parts of that island are Indonesia and include regions like Papua, Central Papua, North Papua, South Papua, West Papua. The territory of New Guinea was on the eastern half and later gained independence from Australia. It had been a German, then British and then Australian colony.
Guyana (English) and Guiana (French) derive from a word meaning watery country. There are actually other Guyana's too. Every major European country had some colonies there.
Guayana region - eastern part of Venezuela used to be Spanish Guiana.
Guyana - used to be British Guyana colony and English is their official language
Suriname - used to be Dutch Guiana before independence
French Guiana - still a territory of France
Amapa - now a state of Brazil used to be Portuguese Guyana
The entire Guyana region has more in common culturally and economically with the Caribbean region. Mainly because the entire region is completely isolated from the bulk of South America by what is called the Guiana Shield - dense rain forest and mountains with rough terrain and limited roads.
Partly that is why Guyana, French Guiana and Suriname play soccer in CONCACAF (N and C America and Caribbean nations) as opposed to CONMEBOL (S American countries) although the level of competition in S America is another reason.