The World Wide Fund for Nature, originally called the World Wildlife Fund (which remains the organization's legal name in the US and Canada), has always been known as the WWF. Hence, when the World Wide Wrestling Federation shortened its name to the same initialism, a lawsuit ensued. The environmental organization came out victorious, so the wrestling company had to change their name to the World Wrestling Entertainment, or WWE for short.note As a result, all references to "WWF" in older productions were censored in some way or another for many years. A later agreement now allows WWE to broadcast or stream all pre-2002 footage uncensored, but in new productions, the older "chrome" logo is now redesigned to eliminate the "F". Both agreements allow WWE to use "World Wrestling Federation".
In the 1960s and 70s, the highest profile fed of Australia was called World Championship Wrestling. Yeah, the same name as that later fed in the US.
ALSO similarly, the fact that Steve Williams was known as Dr. Death at the same time pro wrestler David Schultz was also known as Dr. Death (shortened to Dr. D. as a result). Schultz was (in)famous (and later blackballed) for the 20/20 segment where he cuffed John Stossel for calling wrestling fake.
The Hart owned Stampede Wrestling promotion in Canada had two wrestlers named Kendo Nagasaki. One wrestled primarily in the UK's World Of Sport and used the kind of sword seen in sport of kendo. The other wrestled primarily in USA promotions like AWA, WCW as well as Puerto Rican WWC and used a "kendo stick"(Singapore Cane). For further confusion, both men also wrestled in Japan.
In an absolutely bizarre coincidence, former TNA wrestler/evil security guard Murphy's real name is Michael Cole. Oddly enough, the WWE commentator uses that as a Stage Name, as his real name is Michael Coulthard.
Chris Candido, Chris Michaels and Johnny Hotbody teamed up as the Suicide Blondes, as did Christian Cage and Sexton Hardcastle. As did Jason Lee, Rip Rogers, Flash Flanagan and Derrick King. As did Jennifer Blake and LuFisto.
Who are the Nightbreed? Glen Osbourne and Max Thrasher (ECW), Jackal and Cabal (GCW), Abaddon and Baltazar (WCPW), Snare and Nathaniel Creed (EDW) or Lucifer Grimm and Snakeman (EGW)?
There's also a third MVP who eventually became known as the KISS Demon in WCW.
A wrestler from the USA, Widow Maker Angel Williams, also know as Dark Angel, is often stumbled upon by Canadian and Mexican fans looking for a very different Angel Williams and Dark Angel. To fans in the USA, they are better known as Angelina Love and Sarah Stock, so there is less confusion, Dark Angel instead inspiring words about an insanely long iron man match.
Rosa Negra of CMLL and The Black Rose Nikki Adams are of no relation to Black Rose\La Rosa Negra of WWC and Ring Warriors.
The Apocalypse of UPW fame is not the same one who had a stint in Ring of Honor.
The River City Wrestling promotion established in Winnipeg during 1993 and the River City Wrestling Established in San Antonio Texas in 2002 are not related to each other, in spite of sharing a name.
The International Wrestling Cartel has featured Matt Stryker, perhaps most famous for his uni brow, and Matt Striker, your teacher.
An infamous case that went to court revolved around the Místico gimmick in Mexico, CMLL vs the man who became known as Hunico(he lost). It was later used as the basis for their feud over the Sin Cara gimmick.
Companies referring to themselves primarily by acronyms leads to those that technically don't have the same name being called by the same name anyway, such as American Combat Wrestling in Florida and Anarchy Championship Wrestling in Texas (and that also has a traditional example in the Georgia based Anarchy Wrestling)
Is The United States Wrestling Organization Tag Team and Music City Champion Kevin Dunn, or is he that guy who does WWE's TV?
In Canada based Top Ranked Wrestling, the Explicit Content Stable unleashed the tag team known as Double Platinum, made up of Disco Fury and Vance Nevada. In Ohio Valley Wrestling, Ryan Howe found a kindred spirit in Rock Star Spud, the two forming a tag team known as...Double Platinum.
Around 2003, two wrestlers known as Luscious Latasha who also looked almost exactly alike, broke into the business. The easiest way to tell them apart was that one Luscious Latasha was nearly a foot taller than the other. The taller woman later became known as "La La". Before she did, this Luscious Latasha would also be mistaken for a Canadian wrestler who valeted for the Ballard Brothers as "Luscious" and veteran wrestler "Simply Luscious", even though she was black and the latter two were white(albeit, heavily tanned whites but still noticeably lighter skinned)
When NWA Mid-South briefly left the National Wrestling Alliance, it wisely chose not to go back to using it's old name, Warriors Of Wrestling Federation, as another promotion called Warriors Of Wrestling had since sprung up in New York.
Both SHINE and Vintage Wrestling had tag teams known as "The Buddy System" around the same time.