Does removing the 'Lucas' from Bishop's name count? Lucas Bishop is a fine alias but his name is Bishop. Does that make Shard's name 'Shard Bishop'?
 
Also Cyclops. He doesn't even appear to have only one eye, he's just got a visor with a slit in it. He's Scott Summers, doesn't need a codename.

Definitely X-Man.  He should just go by Nate Grey.

I hate anyone who has the literal moniker of what they are... like Iceman... Because Fever Pitch isn't Fireman... 

Warpath -> Thunderbird 

I hate anyone who has the literal moniker of what they are... like Iceman... Because Fever Pitch isn't Fireman... 

Definitely X-Man.  He should just go by Nate Grey.

Angel/Archangel to something not generic like Metatron or Raziel
Maybe I'll have Domino named as Crosshair

I never liked Bobbys codename. Iceman. Especially because it ends on -man. "Glacier" or something like that would have sounded great.
 
As for Scott, I think his Age of X codename Basilisk was waaay better. Plus, Mike Columbus looked more like a cyclops.

Change Sunspot to Eclipse

Boom Boom to Dynamite, I think would be better. I Like Boom Boom but Dynamite would explain her powers better
Rogue to Vampire because of her powers.

Wolverine = Clawrawrsaurus 
Professor X = Pro Fessor X-Treme!  
Nightcrawler = Captain B.A.M.F 
Boom Boom = Boomstyxxx 
Shadowcat = Kitty Slaughter  
Beast = Dr FuzzKnuckle O Hara 
Psylocke = Ms New Booty 
Emma Frost = Ms Bling Bling with the Frosty Ching Ching 
Magneto = Ze Fassbender 
Iceman = Banilla Ice Baby 
X-23 = Clawrawrsaurus 23 
Jubilee = Poppy Pop 
Cyclops = Slim Shady  
Angel = The Mighty Maverick Goose 

Wolverine = Clawrawrsaurus Professor X = Pro Fessor X-Treme!  Nightcrawler = Captain B.A.M.F Boom Boom = Boomstyxxx Shadowcat = Kitty Slaughter  Beast = Dr FuzzKnuckle O Hara Psylocke = Ms New Booty Emma Frost = Ms Bling Bling with the Frosty Ching Ching Magneto = Ze Fassbender Iceman = Banilla Ice Baby X-23 = Clawrawrsaurus 23 Jubilee = Poppy Pop Cyclops = Slim Shady  Angel = The Mighty Maverick Goose 

B.E.S.T. P.O.S.T. E.V.E.R.

He's not an x-man but Apocalypse.... he never actually suceeded in ending anything...

@The Myth: I just started watching the Mutant X TV series.

@SC: love some of those names. But you can change Logan's name. It so describes his charcter perfectly. You can definitely chane Shadowcat to Kitty Slaughter.

Wolverine = Clawrawrsaurus Professor X = Pro Fessor X-Treme!  Nightcrawler = Captain B.A.M.F Boom Boom = Boomstyxxx Shadowcat = Kitty Slaughter  Beast = Dr FuzzKnuckle O Hara Psylocke = Ms New Booty Emma Frost = Ms Bling Bling with the Frosty Ching Ching Magneto = Ze Fassbender Iceman = Banilla Ice Baby X-23 = Clawrawrsaurus 23 Jubilee = Poppy Pop Cyclops = Slim Shady  Angel = The Mighty Maverick Goose 

It'd be nice if they gave Emma a real code name even if they rarely used it.

Jubilee needs a new codename to show her vampiric nature. Too bad I can't think of any.

Cyclops is iconic but kinda stupid... 

Wolverine = Clawrawrsaurus Professor X = Pro Fessor X-Treme!  Nightcrawler = Captain B.A.M.F Boom Boom = Boomstyxxx Shadowcat = Kitty Slaughter  Beast = Dr FuzzKnuckle O Hara Psylocke = Ms New Booty Emma Frost = Ms Bling Bling with the Frosty Ching Ching Magneto = Ze Fassbender Iceman = Banilla Ice Baby X-23 = Clawrawrsaurus 23 Jubilee = Poppy Pop Cyclops = Slim Shady  Angel = The Mighty Maverick Goose 

Surprised no one mentioned Strong Guy....poor Guido

Surprised no one mentioned Strong Guy....poor Guido

Iceman = Iceman
Beast = Beastman 
Wolverine = Clawman
Professor X = Professorman 
Nightcrawler = Nightman 
Colossus = Steelman
Shadowcat = Catwoman 
Magneto = Magnetman
X-23 = Clawgirl
Etc.

Cyclops = Kaos  Jubilee = Blood or Buffy Emma Frost = Diamond Doll Namor = Sea Man Frenzy = Assault Gambit = Battery Rogue = Reaper

Wolverine- Everywhere Man
Cyclops- Leader of entire mutant population... really??? Man
Gambit- Needs his own comic Man
Wolverine- Seriously, everywhere! Man
Wolverine-.......come on! Man
Wolv.... Dammit! Knock it off man!
Jubilee- She's a vampire now? Man
Daken and X 23- More ways of cashing in on Wolverine craze. Man
Magneto- Can you just turn back into a villain again and throw Wolverine into space? Man

seriously, only the X-Man/Nate Grey thing. 

As long as they don't use Namor's code name I'm happy with the ones they have now.

Emma Frost ---> Diamondheart

Cyclops = Kaos  Jubilee = Blood or Buffy Emma Frost = Diamond Doll Namor = Sea Man Frenzy = Assault Gambit = Battery Rogue = Reaper

Storm. I'd change it to Monsoon, Natural Disaster, Weather Witch or Lightning.  Just because I think Storm is too plain. But honestly, I'd prefer it if they all just used their real names. Code names are so passe.