OMG

Daisy - One of the first names for transfem Jax. The name Daisy originates from ep 6, in which Jax and Pomni sing Daisy Bell to taunt Zooble. Daisy is also a specific au version of Jax, which was created by @dragon-spaghetti, @baguettenjoyer-deactivated20260 (rip), and @trashasaurusrex . This au is part of the reason why transfem Jax grew in popularity as a headcanon and theory.

Jaz - A simple genderbend of Jax's name. I think this name originates from @sirakitz and they have drawn many wonderful artworks of Jaz. Variations of this name include Jazmin, Jazmine, Jasmin, Jasmine and Jazzy

Jinx - This name leans more cool than cutesy, it's still pretty cute though ^^. Jinx's name originates from @citrus-mistrus

Jaxinne - I've seen this name from multiple places. I think it started as a joke name (kinda like the "step 1: Denial, step 2: Daniel" names), but now more people use it seriously. @sunnybugster makes lovely fanart of Jaxinne, check them out!

Juniper - This name originates from a great fanfic series by @clatter-pillar . Go read it! It's really good, I love Juniper & Pomni's QPR and clatter's writing style :] I Know How to Live - Clatter_pillar - The Amazing Digital Circus (Web Series) [Archive of Our Own]

Julie - This name comes from @incorrectpasswordip 's artwork. His art is gorgeous :]

Phoebe - This name comes from kipricot's fanfic series Another Season. The fic series has lots of Ribbit and grapples with the transition from the circus to the real world. I will warn that this series does have nsfw moments and heavy topics (suicide and grief), although the sex scenes are sparse. Another Season - kipricot - The Amazing Digital Circus (Web Series) [Archive of Our Own]

Riley - Another name from a post circus fic. This name is by @maddolphin777 .The fic is mostly about Riley's attempts at suicide. Everyone is characterised very well and the ending is simple but sweet :] Exit Stage Left - Chapter 1 - MadDolphin - The Amazing Digital Circus (Web Series) [Archive of Our Own]

Lily - This name comes @astraleliza 's au where Caine grants the cast's greatest desires. Jax's desire? To be a girl. The comic at the time of writing has 8 parts, I recommend giving it a read!

Ariel - I've seen this name floating around because of a Gooseworx tweet where she said that Jax's was briefly obsessed with Princess Ariel as a child. I think multiple people thought of it around the same time but @deadnettlesanddandelions 's post on it is pretty popular

Egg - Egg. Egg by @captain-heartstrings . Egg, egg, egg

Jaxlyn - My personal transfem Jax name. I headcanon that Jax named herself (shout out to chubs_deuce's headcanon that Jax tried to name himself jackass), so her partially holding on to the first name that kind of fit her makes me happy :3

Jen - This name is from @graystar127 's fic "It's her fault, she should have to fix it!" I think this was the first multi chapter transfem Jax I've read. It's a rare transfem Jax ribbun fic so if you like ribbun and dresses, I'd definitely give it a shot! It's her fault! She should have to fix it! - Chapter 1 - Graystar1 - The Amazing Digital Circus (Web Series) [Archive of Our Own]

Jackie - I've seen this name used by many people, but I think it's first used in CrowFlier's fic "What changed?". They play paintball in this fic. There is also a suicide attempt, so content warning for that. Go read it! What Changed? - Chapter 1 - CrowFlier - The Amazing Digital Circus (Web Series) [Archive of Our Own]

Jaqueline - This name is from WennaBar's fic "Bunnyboy". I won't spoil how she got the name, but the naming scene is very sweet :3 Bunnyboy - Chapter 1 - WennaBar - The Amazing Digital Circus (Web Series) [Archive of Our Own]

Dahlia - I've seen this name in 2 fics. Count the fingers by SamanthaAres, and Mask undone by @femlich2233 . Major content warning for the second fic, it has a lot of dark topics and nsfw scenes. I'd recommend just reading the tags for that one since it's a lot. Count The Fingers - SamanthaAres - The Amazing Digital Circus (Web Series) [Archive of Our Own] , Mask Undone - Chapter 1 - Femlich2233 - The Amazing Digital Circus (Web Series) [Archive of Our Own]

That's all I've found so far. If you know of any other names, please tell me so I can add it in a reblog or amendment ^_^