It's odd, to me, but if you start searching for the kinds of chili peppers grown and exported from Sri Lanka, they call them chili peppers. One site said bird's eye peppers, but that's only one site.
When cultural or export sites talk about chili peppers, that's what they call them, they don't distinguish what kind of chili pepper.
Also Sri Lanka grows spices like black pepper, cardamom, things we don't grow in the US.
It may just be that the OP is growing chili peppers and they don't distinguish between different kinds of chili peppers.
If I asked my neighbors what kind of tomatoes they were growing, they'd say, tomatoes, you know, garden tomatoes.
Buying specific seeds to specific types of peppers might not be something that is available there.