The comments so far have been boilerplate – some just listing out some nicknames, and others saying a lot of them are not for public consumption.
In any case, for me, my nickname is a source of identity. I think there are a few criteria that it satisfies that make it so.
- My “real name”, as I write it in most places (“Karthik S”), is incredibly common. So identifying myself as “Karthik” or “Karthik S” or “S Karthik” is hard. Not that many people (especially those I mostly interacted with more than 10 years back) easily identify me by my “full name”
- My nickname is not obscene (I’ve found that names such as “cock”, “dildo”, “condom”, which are rather common in places like IITM don’t stick after graduation)
- My nickname is rather unique. I don’t know anyone else (at all – either at IITM or otherwise) named Wimpy (apart from the Popeye character). So among people who know that Wimpy is one of my names, identifying myself thus means they can instantly recognise me
Guests at a party over the weekend included a couple of guys from IITM. My wife primarily know them by their nicknames (since that’s how I’ve always referred to them), and proceeded to introduce them as such to her friends (it helps again that both of them have rather unique nicknames, and common first names) using their nicknames.
So “seniors” at elite institutions – when you go through the rituals of giving “freshies” their names – keep in mind that if you make your choice well, the names you endow will continue to be used for decades. So eschew the lunds and the condoms and the dildos, and get creative. And a nice back story for the name helps as well!