It's important to note that "Thiriphala" refers to a combination of three fruits - Haritaki, Vibhitaki, and Amalaki - and not just Haritaki alone. However, in many contexts, "Thiriphala" is used to refer to Haritaki specifically.
You might also find Haritaki referred to as நெல்லி (Nelli) in some contexts, but this is more commonly used for the Amalaki fruit.