Il add a few more names. But honestly struggling to think of any who aren't taken.
Abismo Negro Jr.
Akito
Alex Gracia
Alex Taylor
Allie Kat
Amakusa
Amale
Amasis (Desean Pratt)
Ami Sohrei
Andre Chase
Angelina Love
Anthony Andrews
Aramis
Arisu Endo
Aron Stevens
Ashton Smith
Atsushi Kotoge
Atticus
August Matthews
Bam Sullivan
Banny Oikawa
Blue Panther Jr.
Bobby Flaco
Bodhi Hayward
Bodhi Young Prodigy
Bonesaw
Brayden Toon
Brian Johnson
Bronco Nima
Brooks Jensen
Bryan Idol
Bryce Hansen
BT Gunn
Bárbaro Cavernario
Casanova Valentine
Charles Crowley
Charles Mason
Charlie Tiger
Chessman
Chik Tormenta
Cibernetico
Cole Radrick
Corvin
CPA
Daiki Inaba
Daisuke Harada
Daisuke Sasaki
Dak Draper
Dan The Dad
Danshoku Dieno
Dark Panther
Davey Bang
DKC
DMT Azul
Dr. Wagner Jr.
Drago
Drew Gulak
Drew Parker
Dyln McKay
Eddie Dennis
Effy
Eita
El Cuatrero El Terrible
El Hijo de L.A. Park
Ellis Taylor (Pat Dynamite)
Eric Ryan
Eric Smallz
Faby Apache
Forastero
Franky The Mobster
Fukigen Death
Fuminori Abe
Gaagz the Gymp
Garrison Creed
Gino Gambino
Gota Ihashi
Grim Reefer
Hajime Ohara
Hanan
Harukaze
Haruna Neko
Hazuki
Hideki Okatani
Hikari Noa
Hikaru Sato
Hina
Hiroyoshi Tenzan
Hokuto Hidaki
Hokuto Omori
Hoodfoot
Hunter Drake
Ichiban
Itsuki Aoki
Izanagi
Jake Manning
Jay Bradley
Jeffrey John
Jimmy Lloyd
John Wayne Murdoch
Johnny Swinger
Judais
Juicy Finau
Jun Kasai
Kale Dixon
Kanon
Kaori Yoneyama
Katsuhiko Nakajima
Kaya Toribamo
Kazusada Higuchi
Keyra
Kidd Bandit
Kiku
Kiyoka Kotatsu
KJ Orso (Fuego Del Sol)
Knox
Koguma
Koji Doi
Koki Iwasaki
Konami
Kotaru Suzuki
Kratos
Kris Chambers
KUDO
Kuma Arashi
L.A. Park
L.A. Park Jr.
Lady Maravilla
Lady Shani
Latigo
Leva Bates
Lucien Price
Látigo
Mahiro Kiryu
Maika
Makoto Oishi
MAO
Marco Corleone
Marko Estrada
Marko Stunt
Masaaki Mochizuki
MASADA
Masahiro Takanashi
Masakatsu Funaki
Masato Tanaka
Mathis Myre
Matt Makowski
Matt Tremont
Matt Vandagriff
Maya Yukihi
Mephisto
Microman
MIRAI
Miyu Amasaki
MIZUKI
MJ Paul
Moka Miyamoto
Momo Kohgo
Monster Clown
Mr. Danger
Mr. Iguana
Murder Clown
Myles Borne
Máscara Dorada
Nao Kakuta
Naomichi Marufuji
Natsuko Tora
Nia Jax
Nick Gage
Nina Samuels
Nioh
Nobuhiro Shimatani
Nodoka Tenma
Nunzio (Little Guido)
Odyssey Jones
Omos
Ophidian
Otis Cogar
Pagano
Parker Boudreaux (Harland)
Parrow
PCO
Pokotan
Pom Harajuku
Psicosis II
Psycho Clown
Puma King
Raku
Ram Kaicho
Reed Bentley
Reika Saiki
Rene Dupree
Rico Gonzalez
Rika Tatsumi
Rina
Rolando Freeman
Rugido
Ryuji Ito
Ryusuke Taguchi
Saki Kashima
Sakutra Hirota
Sam Stackhouse
Sanson
Santana Jackson
Saori Anou
Sarah Rowe
Satnam Singh
Sawyer Wreck
Sayaka Obihiro
Sayuri Namba
Seigo Tachibana
Sexy Star II
Shigeo Okumura
Shinya Aoki
SHLAK
Shoka Nakajima
Shota
Shotaro Ashino
Shuichiro Katsumra
Shuji Ishikawa
Shuji Kondo
Sidney Akeem (Scrypts)
Sonny Kiss
Star Jr.
Suwama
Suzume
Tadasuke
Taichi
TAJIRI
Taka Michinoku
Takao Omori
Takashi Iizuka
Takuyua Nomura
Tallon Jr.
Tamina
Teoman
The Blade
The Bodyguard
Tim Storm
Togi Makabe
Tomoaka Honma
Tomoaki Honma
Tomoka Inaba
Tony D'Angelo
Toshiyuki Sakuda
Trevor Murdoch
Ultimo Dragon
Ultramantis Black
Vaughn Vertigo
Veer Mahaan (Rinku Singh)
Vicky Haskins
Victoria Crawford (Alicia Fox)
Violento Jack
Waka Tsukiyama
Yappy
Yoshiki Inamura
Yoshitatsu
Yoya
Yuji Hino
Yuji Nagata
Yuki Aino
Yuki Arai
Yuki Ino
Yuki Ishikawa
Yuki Kamifuku
Yuki Ueno
Yukio Naya
Yukio Sakaguchi
Yuna Manase
Yuna Mizumori
Yusuke Kodama
Yusuke Okada
YuuRi
Zoe Sager
Zues
Último Guerrero
Some of these have been taken in the last two days, but most of these are available.