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

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

nrn
——————
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 ]
November 9, 2009 at 2:57 am
parava, catamaran, dampier, the new vc firm or whatever.
November 10, 2009 at 10:51 am
catamaran
———————v.chandrashekar
November 11, 2009 at 11:53 pm
A: Kuyavar/Velar
B: Catamaran (from the Tamil ‘kattumaram’)
C: William Dampier
D: Narayana Murthy who has just started a VC fund called Catamaran