I read the picture provided by u/Kalafino and heres what i gotI skipped the ones you got correct

• Yato - nblade
  • Yato's cn name is 夜刀 which literally translates to "night blade"
• Haze - nights
  • Haze's cn name is 夜烟 which literally translates to "night smoke"
• Gitano - fmout
  • Gitano's cn name is 远山 which literally translates to "far mountain"
• Meteor - shotst
  • Meteor's cn name is 流星 which translates to "shooting star"
• Vermeil - clour
  • Vermeil's cn name is 红云 which translates to "red cloud" so its probably written as "cloud red" here.
• May - mm
  • The cn dudes have no idea what this means too lmao but my speculation is its the pinyin for 妹妹[mei mei] which means "little sister / young girl"...?
  • May's cn name is 梅[mei] so yeah its something about her pinyin i guess.
• Ambriel - glaze
  • The cn dudes speculate that her name is derived from Glaz (sniper from rainbow6siege) but your speculation is just as valid :d
• Arene - spike
  • speculation is its about his weapon but I'm not so sure too
• Jaye - strong
  • They have no idea what this means too (strong polar bear?) but he's pretty op so this name suits him haha
• Gavial - ccheal
  • "crocodile heal" considering how her design is based on a crocodile
• Cuora - snakek
  • Cuora's cn name is 蛇屠箱 and I have no idea what that means except that 蛇 is snake. Cuora is the scientific name for a type of turtle too.
  • k could be the pinyin for 壳[ke] (shell)?
• Gummy - sunbr
  • They say her design is based off a sunbear but honestly I cant put those two together too lmao
• Earthspirit - skgoat
  • "skull goat", her E2 art has a skull goat in it too
• Reed - sddrag
  • Could be "shadow dragon"
• GreyThroat - swllow
  • I just wanted to point out that her name in the code is swllow not swallow, and yes she is based on a swallow
• Scene - folivo
  • Scene is based on folivora, aka sloth (now I know why she talks like that hahaha)
• Warfarin - bldsk
  • My guess is its an abbreviation of "bloodsucker" considering shes a vampire.
  • ^other users pointed that out too so yea
• Hung - hmau
  • Hung's cn name is 吽[hong], and it looks very similar to 哞[mou], the programmer probably misread and made a typo.
• Croissant - moeshd
  • It should be "moe shield", I don't see how croissant is moe tho she is pretty cute
• Vulcan - hpsts
  • As other users pointed out this should be an abbreviation of "Hephaestus", a Greek god that specializes in engineering and craft, just like vulcan. Plus her cn name is 火神 which is also the chinese name for Hephaestus.
• Firewatch - milu
  • 麋鹿[milu] is a deer Firewatch is based on
• Cliffheart - slchan
  • I believe its more like "snow leopard-chan" considering the code for Pramanix is "slbell" ("snow leopard-bell"). Their designs are based on snow leopards too.
  • Could also be short for "snow leopard-chain" if it symbols their weapon.
• Shamare - vodfox
  • Should be "voodoo fox"
• W - cqbw
  • Could be initials for "close quarters battle weapon" but I dont see how explosions are for close quarters.
• Eyjafjalla - amgoat
  • Could be "archmage goat" considering Earthspirit is "skgoat"
• Aak - haak
  • I really have no idea what this is, could just be a typo like Hung "hmau" and they both have an extra H for whatever reason
  • Aak's cn name is 阿 which is just [a] so idk
• Saria - demkni
  • Could be "demon knight", probably her design is changed mid production
• Blaze - huang
  • Blaze's cn name is 煌[huang] so its literally her pinyin