Here's how you might translate it in English:
* Star fruit tree: This is the most literal translation and clarifies what kind of tree it is.
* Star fruit: This is the most common English name for the fruit itself.
* Averrhoa carambola: This is the scientific name for the star fruit tree.
So, depending on the context, any of these options would be appropriate for translating "kamias" or "kamyas" into English.