I'd actively try importing it if it's good

They actually wanted to do something like that a few years back, a smaller comics company wanted to do stories based on all Ishinomori's heroes but they only ever got the Cyborg 009 comic produced to to rights issues. Though for those they just wanted to do reimaginings of existing riders.
But a purely American Rider? Yeah I'd be down for that.

What is the etymology of Heisei Rider names? For example, Kiva is a likely play on 'Kiba', or 'Fang'. Kuuga is a word derived from the Grongi themselves, but where was it sourced from during the conception stage? Same for Agito, Faiz, Hibiki?

Kuuga stems from its kanji pronounciation 空我 which by rearranging the order roughly translates to we become the sky(Ware, Soranari) it seems. Also Kuwagata, the word for stag beetle, plays in as well.

Agito derives from the latin word agito which means I move.

Ryuki literally Dragon Knight

Faiz derives from the greek alphabet phi and its input code 555 > fives > Faiz

Blade from its motif suit spade being related to the word spada which means sword

Hibiki from the word hibiki(響き) which means ringing in relations to his concept

Kabuto from his motif which is in Japanese kabutomushi

Den-O from Densha no Ou which means king of trains

Kiva like you said derives from the Japanese word for fang, but also means King of Vampires

Decade because it is the 10th rider

W from the word double and the fact that w is pronounced daburyuu in Japanese probably factors in too

OOO from its three medals setup made up of three O shaped medals and partially king

Fourze > Four Zero > 40th anniversary

Wizard... self explainatory

Gaim from the show's concept being about armored warfare(gai being armor and m/mu being warfare)

Ghost cause he starts as a dead dude and pretty much utilizes ghosts

Ex-Aid means Extreme Aid

Build cause he gets built using the essence in the full bottles

Ex-Aid also can be a reference to the .exe file extension.

Of course Sunred would know this.

Ok that is clever.

Thought it would be fun to make a full list for this.

Kuuga: "Empty Self"
Agito: "I move" in Latin, as mentioned before
G3: Generation 3, just to sound like a cool designation for a manmade Rider
G3-X: Same as G3
Gills: Refers to his and his character's aquatic themes
Another Agito: 🤔
G4: "Generation 4", same as G3
Ryuki: "Dragon Knight"
Knight: Knight motif
Scissors: For cutting
Zolda: From "soldat", German for soldier
Raia: From the Latin word "raia", used in scientific context to refer to rays
Gai: Some kanji that can be pronounced this way include "harm", "arm oneself", "armor", "white", "infancy", and "anger", among others.
Ouja: "King Snake"
Tiger: 🤔
Imperer: From "impala"
Odin: Germanic/Nordic god
Femme: 🤔
Verde: "Green" in some romance languages
Ryuga: "Dragon Fang"
Faiz: "Fives" (555), or "Phi's"
Kaixa: Greek letter Chi is pronounced kai, also sounds like "Kaiser"
Delta: Delta (Δ)
Psyga: Psi (Ψ)
Orga: Corruption of "Omega", I guess
Blade: Wields a blade, Spada means blade
Garren: French name that means "Guardian",
Chalice: The Minor Arcana counterpart of the Suit of Hearts is the Suit of Cups
Leangle: A leangle is an aboriginal war club
Glaive: A sword
Larc: L'arc is French for bow
Lance: A lance could parallel Leangle's polearm
Hibiki: "Sound Demon"
Ibuki: "Intimidating Breath Demon"
Todoroki: "Roaring Demon"
Zanki: "Beheading Demon"
Danki: "Bullet Demon"
Sabaki: "Judgment Demon"
Eiki: "Sharp Demon"
Shuki: "Crimson Demon"
Gouki: "Strong Demon"
Toki: "War Demon"
Shouki: "Victory Demon"
Banki: "Barbarian Demon"
Kabuki: "Dancing Demon"
Touki: "Freezing Demon"
Kirameki: "Gleaming Demon"
Nishiki: "Western Demon"
Habataki: "Feather Attack Demon"
Kabuto: Kabutomushi, the rhinoceros beetle, or kabuto, a helmet
Thebee: 🤔
Drake: A drake is a dragon, Drake is a dragonfly
Sasword: Sasori (scorpion), sword
Gatack: Kuwagata, attack
KickHopper: He kicks
PunchHopper: He punches
Caucasus: Caucasus beetle
Hercus: Hercules beetle
Ketaros: Honestly can't figure this one out.
Den-O: Short for "Train King"
Zeronos: I'm guessing it's "Zero" adapted into a cool name
Gaoh: "Fang King"
Yuuki: "Dark Steam", homonym of ghost
Kiva: "Fang"
Ixa: Could mean "ixer", the French pronunciation of X (a cross) being "ix".
Saga: Japanese word "saga" means "one's nature", "tradition".
Rey: "Rei", cold.
Arc: The word arc has a variety of meanings. Something more specific might be obvious to someone who's seen all of Kiva.
Decade: 10 years of Heisei Riders
Diend: "The End"
Kivala: Feminine twist on Kiva
W: "W" is pronounced like Double in Japanese
Accel: Accelerator
Skull: Skull
Eternal: That's just his motif, okay?!
OOO: Representing 3 medals
Birth: Happy birthday!
Poseidon: Greek god of the sea
Aqua: Aqua
Fourze: Four Zero, fortieth anniversary
Meteor: S p a c e
Nadeshiko: Japanese name
Wizard: not a magician
Beast: Beastly
Wiseman: Who knows, but it sounds magicky
Mage: Mage
Sorcerer: Sorcery
Gaim: Gaimu, "Armored Warrior"
Baron: European chivalric title of honor
Ryugen: "Mysterious Dragon"
Zangetsu: "Beheading Moon"
Gridon: Ornac
Kurokage: "Black Shadow"
Bravo: Bravo, bravo! Encore!
Knuckle: For punching
Duke: European chivalric title just below a monarch
Sigurd: Mythological Nordic hero
Marika: Arabic for "queen"
Zangetsu Shin: "New Zangetsu"
Jam: Jamu, "Wicked Warrior"
Bujin Gaim: "War God Gaim"
Fifteen: Fifteen Heisei Riders
Mars: Roman god of war, or Malus, a genus of apple trees
Kamuro: "Crown"
Idunn: Iðunn, Nordic goddess of apples and youth
Tyrant: Well, he wishes he was one
Saver: Does not actually save things
Black Baron: Rotten bananas
Drive: Cars
Mashin Chaser: "Advance Demon Chaser"
Mach: Mach speed
Chaser: Chases
Lupin: Fictional French thief
Ghost: Specters
Specter: Ghosts
Necrom: Necromancer
Extremer: The extremest
Ex-Aid: Officially short for "Extreme Aid"
Brave: Brave knights
Snipe: Guns
Lazer: Spelled very similarly to "Racer"
Genm: Genm Corp.
Para-DX: Pronounced "paradox", a pun on Parado
Poppy: Poppy
Cronus: Greek god who was overthrown by his son Zeus. His name is pronounced like "Chronos", the Greek personification of time.
True Brave: Actually fake Brave
Fuma: "Wind Devil"
Build: Building, something something science
Cross-Z: Pronounced like "Claws"
Cross-Z Charge: Super cool
Grease: Robots
Rogue: Night Rogue

Actually, I remember hearing Agito was an old way one could say the Japanese word for gills. Imperer is likely a play on Impaler too and Garren's a corruption of Galleon

IXA is actually probably named for the Japanese word "ikusa," meaning battle or war, given his crusader motifs.

This legit just blew my brainmeats.

Gills' name is a multi-layered pun; in addition to referencing Ryo being a swimmer, there's an archaic Japanese word for gills, written with the kanji 顎, which is pronounced "agito".
Here's the thing lol