Some ‘general knolij’ , and a nice funda.

The tamilian artisan sect A, that owes its name to a distinct variety of clay pots.

The tamilian fisherman sect, that is A

, used boats B, similar to shown in pic B.

boat

boat

The english word for B, a distortion of the original Indian usage, was coined by the pirate/explorer C, shown in pic C.

pirate

pirate

As usual, A, B , C?
Lastly, connect B to D, shown in this pic..

nrn

nrn

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Cracked by Priya, Chandrashekhar, and Mrinalini

Answer

Firstly, a huge blunder on my part.
The clay pot etymology was considering that it was Karavas. [ the word has Pali origins, karaka etc]
Mea Culpa.

As the commenters pointed out , these are the acceptable answers.

A – Paravas , a fisherman community.
B – Catamaran, (from Tamil kattumaram) is a type of multihulled boat or ship consisting of two hulls, or vakas, joined by some structure,the most basic being a frame, formed of akas.
C – William Dampier

D – NR Narayana Murthy recently started a VC firm called Catamaran.
[ this was supposed to be the original question, the rest were hurriedly gathered bits. oops ]