[Nerwen]

Also–

Guide to Players' Nicknames

Agan– Aganzir
Alona– Alonariel
BeiGe, BeiGei– Blind Guardian
BG– Blind Guardian
Boro– Boromir88
Brinn– Brinniel
Cabbie– McCaber
Cel, Celly– Celuin
CoD– Captain of Despair
Cupcake, the– satansaloser2005
Di– Diamond18
Dun– Inziladun
Dure, Dury– Durelin
EW– The Elf Warrior
Fea– Feanor of the Peredhil
Foley– Folwren
Form– Formendacil
Glirdy– Glirdan
Glirdypie– Glirdan
Greenie– A Little Green
Gwath– Gwathagor
Kit– Kitanna
Kuru– Kuruharan
Inzil, Inzy– Inziladun
Izzy– Isabellkya
Lal– Lalaith; Lalwendë
Lari– Lariren Shadow
Leggy– Legate of Amon Lanc
Lhuna– Lhunardhwen
Lommie, Lommy– Thinlómien
Lottie– Loslote
Lottiepop– Loslote
Mac– Macalaure
McCobbler– McCaber
Menel– Meneltelmacil
Miggy– The Might
Mira– Mirandir
Mith– Mithalwen
Mnemo– Mnemosyne
Morm– mormegil
Mr Agreeable– Pitchwife
Mr 88– Boromir88
Muffin, the– wilwarin538
Ni– Nienna
Nilp– Nilpaurion Felagund
Nog, Noggins– Nogrod
Pitch– Pitchwife
Sally– satansaloser2005
Sallycakes– satansaloser2005
Sauce– The Saucepan Man
Shasta– Shastanis Althreduin
Steve– Eönwë
Stick– Mirandir
SPAM– The Saucepan Man
SpM– The Saucepan Man
tgwbs– The Guy Who Be Short
tp– the phantom
TORE– The Only Real Estel
tum– autume98
tummy– the phantom (mormegil only)
Vanilwa Muffin, Vanilwuffin etc.– wilwarin538
Wilwa– wilwarin538
Xed– Celuin
Zil– Inziladun

I've left out names like Rune, Legate and Eomer, which I think are self-explanatory.