Dub Name Change/English to Spanish

Comics

 * Marvel Comics
 * Wolverine is maybe the biggest offender about his name in Spanish, since his name was translated as follow, depending of the media involved and country (all the names are from the Latin American versions, unless specified otherwise)
 * Gloton (older versions of the X-Men comics, and the first live-action movie)
 * Guepardo (90s TV series and X-Men: Evolution.)
 * Lobezno (used in Spain only)
 * The most recent TV series, Wolverine and the X-Men, and the live-action movie involving him keeps his English name intact.
 * Batman
 * Bruce Wayne to Bruno Diaz (mostly up to around the 80's)
 * Richard "Dick" Grayson to Ricardo Tapia (ditto)
 * The Joker to El Guasón
 * Catwoman to Gatúbela
 * The Riddler to Acertijo (Latin American) or Enigma (Spain)
 * Two-Face and Poison Ivy to Dos Caras and Hiedra Venenosa (literal translations)

Live Action TV

 * The Addams Family to Los Locos Addams (The Crazy Addams)
 * Gomez to Homero
 * Pugsley to Pericles (as the Greek warrior)
 * Wednesday to Merlina (as Merlin)
 * Fester to Lucas
 * Cousin Itt to Tio Cosa
 * Lurch to Largo
 * Thing to Dedos (Fingers)

Puppet Shows

 * The Muppets to Los Teleñecos (Spain only, before the 2011 movie)
 * Kermit the Frog to La Rana René (Latin America, before the 2011 movie) and La Rana Gustavo (Spain). Similarly to his Portugese "Caco" name change above, Kermit actually explained the former (dubbed) as his accidentally being called "René" when he came to Mexico.
 * Sesame Street to Plaza Sésamo (Latin America) or Barrio Sésamo (Spain)
 * Grover to Archibaldo (Latin America) or Coco (Spain)
 * Count von Count to Conde Contar (Latin America) or El Conde Draco (Spain)
 * Cookie Monster to Lucas, el Monstruo Comegalletas (Latin America, often called Lucas or Comegalletas for short) or Triqui, el Monstruo de las Galletas (Spain)
 * Bert & Ernie to Beto & Enrique (Latin America) or Blas & Epi (Spain)
 * Big Bird to Abelardo (Latin America, during the show's first years; currently known by his English name, while his former name became his Mexican Expy's)

Professional Wrestling

 * Pro Wrestling: First, an explanation: During the 90s, the WWE tried (and failed) to enter to the Mexican wrestling market and some wrestlers got a name change in Mexico (but not everywhere). That practice died out in the 2000s after the WWE became more popular in that country and all the wrestlers are named with the original English names.
 * The Undertaker to El Enterrador
 * The British Bulldog to El Bulldog Britanico
 * Ted Dibiase The Million Dollar Man to El Hombre del Millon de Dolares
 * Sgt. Slaughter to Sargento Slaughter or Sargento Bravo (Sgt. Brave)

Video Games

 * Halo series
 * Master Chief to Jefe Maestro (Keep in mind that "Master Chief" is NOT his real name, but his military rank, since the full name of his rank in English is "Master Chief Petty Officer", and is translated to Spanish as "Jefe Maestro de las Fuerzas Armadas", but many Spanish-speaking players are still thinking that Master Chief is his real name.)

Western Animation

 * The Flintstones to Los Picapiedras
 * Fred Flintstone to Pedro Picapiedra
 * Wilma Flintstone to Vilma Picapiedra
 * Barney Rubble to Pablo Mármol
 * Betty Rubble to Betty Mármol
 * SpongeBob SquarePants to Bob Esponja Pantalones Cuadrados (usually shortened to Bob Esponja)
 * Patrick Star to Patricio Estrella
 * Squidward Tentacles to Calamardo Tentáculos
 * Mr. Krabs to Don Kangrejo
 * Sandy Cheeks to Arenita Mejillas (nearly literal translation).
 * DuckTales (1987) to Pato Aventuras
 * Scrooge McDuck to Rico McPato (Latin America) or Gilito McPato (Spain)
 * Huey to Hugo (Latin America) or Juanito (Spain)
 * Dewey to Paco (Latin America) or Jaimito (Spain)
 * Louie to Luis (Latin America) or Jorgito (Spain)
 * Launchpad McQuack to Joe McQuack (both in Latin America and Spain)
 * The Beagle Boys to Los Chicos Malos (Latin America. Literally, The Bad Boys) or Los Golfos Apandadores (Spain)
 * Super Mario Bros Super Show
 * Toad to Honguito
 * Princess Toadstool to Princesa Seta
 * The Powerpuff Girls to Las Chicas Superpoderosas (Latin American dub)
 * Blossom to Bombón (Latin America) or Pétalo (Spain, literal translation)
 * Bubbles to Burbuja (lit. translation)
 * Buttercup to Bellota (acorn, Latin America)or Cactus (Spain)
 * Professor Utonium to Profesor Utonio
 * Him to Él
 * Fuzzy Lumpkins to Peludito Dientón
 * Princess Morbucks to Princesa Masplata
 * Brick to Bajeza
 * Boomer to Bandido
 * Butch to Bacteria
 * The spanish names of the Rowdyruff Boys only were used in their first time that they appeared, later appearances uses their original names
 * The Adventures Of Sonic The Hedgehog (Latin American dub)
 * Tails to Colitas (this also entailed a gender swap from male to female)
 * Dr. Robotnik to Dr. Mostachón
 * Scratch to Gallotronic
 * Grounder to Chatarra
 * Coconuts to Cocoloco
 * Top Cat to Don Gato y su pandilla (Don Cat and his Gang, Latin American dub)
 * Benny the Ball to Benito Bodoque (can be viewed as a loose translation of sorts; "bodoque" is also used as an endearing nickname in Mexican Spanish)
 * Choo-Choo/Chooch to Cucho (which can mean a number of things, from cat and deformed to manure, among others)
 * Brain to Demóstenes (Demosthenes; which is quite ironic if think of the Greek orator of the same name)
 * Fancy-Fancy to Panza (Belly. No, really)
 * Spook to Espanto (literal translation)
 * Dibble to Matute
 * The Jetsons to Los Supersónicos (The Supersonics, Latin American dub)
 * George Jetson to Súper Sónico (as in supersonic)
 * Jane Jetson to Ultra Sónico (as in ultrasonic)
 * Judy Jetson to Lucero Sónico (lucero means star)
 * Elroy Jetson to Cometín Sónico (cometín being a dimminutive of the Spanish word for comet)
 * Rosie to Robotina
 * Orbitty to Orbitus
 * Mr. Spacely to Sr. Espacial/Sr. Júpiter (first and second series dubs respectively)
 * Most of The Simpsons names were kept intact, though few of them changed in the Latin American dub like:
 * Homer to Homero
 * Reverend Lovejoy to Reverendo Alegría (Joy)
 * Barney Gumble to Barney Gomez
 * Clancy Wiggum to Clancy Gorgory
 * Ralph Wiggum to Rapha Gorgory (though sometimes Ralph creeps in)
 * Nelson Muntz to Nelson Rufino (restored to the original in later seasons)
 * Superintendent Chalmers to Super Intendente Archundia (ditto)
 * Waylon Smithers to Castulo Smithers
 * Wandulo in Who Shot Mr. Burns?, just to keep the S/W clue.
 * Abraham Simpson to Abel Simpson (early seasons mostly)
 * Itchy & Scratchy to Tomy & Daly
 * Some of the Looney Tunes got their names changed:
 * Daffy Duck to Pato Lucas (referencing Spanish Uncle Fester)
 * Elmer Fudd to Elmer Gruñon (Grumpy Elmer)
 * Foghorn Leghorn to Gallo Claudio
 * Yosemite Sam to Sam Bigotes (Moustache Sam)
 * Tweety to Piolín
 * From the 90's TV X-Men series, in Latin American:
 * Cyclops, Storm, Beast and Gambit to Ciclope, Tormenta, Bestia and Gambito (all literal translations)
 * Rogue to Titania
 * Jubilee to Jubilo ("joy")
 * Juggernaut to Leviatan
 * Sabertooth to Leonidas
 * Beast Wars (Latin American)
 * Cheetor to Cheetah
 * Scorpionok to Scorpikon
 * Tigatron to Tigreton
 * Blackarachnia to Araña Negra ("Black Spider")
 * Airrazor to Aguila ("Eagle")
 * Silverbolt to Lobo Plateado ("Silver Wolf")
 * Quickstrike to Cobra
 * Rampage to Rampante ("Rampant")
 * Depth Charge to Mantaraya ("Manta Ray")
 * Starscream to Destello ("Sparkle")
 * Beast Machines (Latin American - all returning characters keep their Beast Wars names)
 * Nightscream to Nocturno ("Nocturnal")
 * Dinosaucers to Los Dinoplativolos
 * Bronto-Thunder to Bronto-Trueno
 * Bonehead to Babalu (short of Babalucas who is a Mexican Spanish slang for dumbass.)
 * Teryx to Terry
 * Dimetro to Demetrio
 * Styraco to Espinaco (a Spanish portmanteau of the words Espinaca [Spinach] and Espinazo [Backbone])
 * Quackpot to Orni
 * Rugrats usually had The Foreign Subtitle of Aventuras en Pañales (Adventures in diapers)
 * Stu to Hugo
 * Drew to Julio
 * Chuckie to Carlitos
 * Phil and Lil to Fili y Lili
 * Tiny Toon Adventures to Tiny Toons
 * Babs Bunny to Babsy Bunny
 * Elmyra to Elvira
 * Sweety Bird to Pio-pi
 * Calamity Coyote to Coyote Calamidad
 * Bookworm to Gusabio (a portmanteau from the words Gusano [Worm] and Sabio [wise])
 * Furrball to Peluso
 * Montana Max to Max Montana (maybe because Max is normally a first name and a diminutive of both Maxwell in English and Maximiliano in Spanish)
 * Animaniacs to Animanía (but only inside the series, It's never used outside the series by neither the Latin American networks nor the voice actors who worked on the dub.)
 * Brain to Cerebro
 * Chicken Boo to Kikiri Boo (Kikiri is the Spanish name of the sound that a rooster does in the morning)
 * Slappy and Skippy Squirrel to Slappy and Skippy Ardilla
 * Dr. Scratchansniff to Dr. Rascahuele (literal translation)
 * Cars:
 * Lightning McQueen to Rayo McQueen
 * Mater to Mate
 * Chip 'n Dale Rescue Rangers to Chip y Dale al Rescate (Chip and Dale to the Rescue).
 * Gadget to Gady
 * Monterey Jack to Monterrey Jack (The pronunciation is the same, they just changed the name from the American city of the same name with the Mexican city who share a similar spelling.)
 * Fat Cat to Mala Cara (Bad Face)
 * Wart to Verruga
 * Tale Spin to Aventureros del Aire (Adventurers of the Skies). The VHS release in the 90s released the series as Cuentos Aereos (Air Tales) but it was never used on series nor by the Latin American networks
 * Kit Cloudkicker to Kit Nubarron (Kit Cloud)
 * Wildcat Willie to Gato Willie (Willie the Cat)
 * The Sea Duck to El Ganso (The Goose)
 * Cape Suzette to Cabo Suzette
 * Thembria to Frigilia
 * Fish Hooks to Pecezuelos.
 * Shellsea to Ostrencia
 * Clamantha to Almejandra
 * Albert Glass to Albert Pez
 * Jumbo Shrimp to Gambo Jumbo
 * Finberly to Aletina
 * Smargot to Claracol
 * Jocktopus to Pulpleito
 * Mr. Baldwin to Sr. Calvillo
 * Principal Stickler to Director Rigorizo
 * Among others.