Hi Dinesh ji,
Here are the Tamil names in their native script:
malaiyavarai: மலையாவாரை (மலை +
ஆவாரை),
malaiyavaram: மலையாவாரம் (மலை + ஆவாரம்),
malaiyavirai: மலையாவிரை
(மலை + ஆவிரை)
I have split the Tamil words above for better clarity.
Dolichos lablab is called "avarai" (அவரை) in Tamil. But the name "āvārai"
(ஆவாரை) and "āvāram" (ஆவாரம்)
refer to
Senna auriculata (here comes the importance of phonetics!).
I think the plant here (
Senna hirsuta) is compared with
Senna auriculata perhaps due to their morphological similarities, and distinguished from it by the prefix "malai" meaning "of hill" or "wild". The term "malai" could also refer to the hairy feature of the plant.