Some factions need better names...

[Charon]

Same goes for the Dark Eldar for exactly the same reasons. If they were going to be calling themselves anything, it should be 'Eldar', because they're the ones who still cling to the old ways from before The Fall.

Not even Craftworlders refer to them as "Dark Eldar".
Commorites and Dark Kin are the most used terms.
The Dark Eldar in turn refer to themselves as Commorites or true kin.

It is just a name for the book. Chaos Space Marines do not refer to themselves as Chaos Space Marines either while Tyranids are actually named after a Planet

[angkor what?]

Codex eldar:-
Craftworlds
Harlequins
Commorites
Outcasts
Exodites

[Fueldrop]

Codex eldar:-
Craftworlds
Harlequins
Commorites
Outcasts
Exodites

Translated.
Codex Panzies:-
Uptight Gitz
Clown Gitz
Cardboard Gitz
Roamin' Gitz
Damn Dirty Hippies

[angkor what?]

Im liking the look of these ork names! Codex eldar :- dark kin looks better than dark eldar or anything commoragh tbf

[Path Walker]

Orks call Space Marines Beakies and chaos Spikee Boyz, Eldar were unfortunately called Panzies which they avoid using these days for obvious reasons.

Squats were called Stunties as well, so covered in that if they come back

[Fueldrop]

Now I'm envisioning the Orcs writing the fluff for codexes other than their own:

"So den da blue beakie, whatsisface, deir boss. You's lot know who I's talking about. Anyway, he did some stuff but it didn't involve da Orks so it ain't important. I fink dere was someting about da panzies and deir god fing involved. Or summin like dat. Who gives a grot's droppin's about what dem 'umies get up to?"

Codex: Beakie describes Chapter Master Marneus Augustus Calgar's defeat of the Avatar of Kaine in the battle of Commrath.

[YorkNecromancer]

If all future codicies were written from the Ork perspective I WOULD BUY EVERY SINGLE ONE.

'So dere's dese skinny blokes what's called Eldar or sumfing. Dey's been around for ages, but not one ov 'em knows 'ow to use a choppa to pick 'is teef. Whatsatabaat? Wot kinds is dere? Well... Dere's sum shooty wuns, some really shooty wuns, da really tall wuns wiv loads of dakka... Den dere's da sparkly wuns, da floaty wuns and da bumpy wuns wiv all da skreemin' and dat. Old Dok Dubstepz once wired up a skreemy wun to 'is speakers; made a right noise. Propa bangin' dat was; coulda danced all nite to dat wun. In conclusion, dey is tall, skinny and taste gud wiv squig gravy.'

[Cap'nSmurfs]

Dem bloo blokes gets all da attenshun for sum reason, don' unnerstan' it pers'nally. Dere hats look good on me bosspole tho', hurr hurr hurr.

[Drew da Destroya]

Den dere's da shooty blue 'uns, wiv all da shiny dakka. Dey gets krumped real easy, so chop dem gitz wiv a choppa an' loot da flash dakka! Just watch out for da big 'uns in dere flyin' dred suits. De've got loads of dakka, so you lot've gotta be more kunnin' when krumpin' dem. Send da grotz in first, den jump 'em!

-Ork Codex: Tau

[Fueldrop]

An' den dere's dis spiky boss who keeps trying to Waaaaagh!!!! the 'umies, but 'e keeps screwin' it up 'cos he ain't worked out dat green is best. 'Is spiky boyz is all decked out in black, which any grot can tells ya is a dumb colour for boyz. Anyway, if I was leadin' dose Waaaaaaghs!!! den I'd give da 'umies a right proper stompin', unlike dis armless git.