The discovery of a change in file naming conventions in OS X 10.11.4 is behind a recent growth in speculation that Apple is set to rebrand its OS X desktop operating system.

Mac OS

Screenshot from Mac OS 8 released in 1997.

The rumor appears to have begun on Tuesday after Brazilian Apple blog MacMagazine reported that a name used for an Interface Builder document tucked away in the OS X System folder contained a previously unseen reference to 'macOS'.

Developer Guilherme Rambo discovered that a document in FlightUtilities.framework in /System/Library/PrivateFrameworks takes the name FUFlightViewController_macOS.nib, which it did not have prior to last week's release of OS X 10.11.4.

macOS reference

Image: Guilherme Rambo

Speculation appears to be based on the fact that iOS, watchOS, and tvOS already take similar naming conventions, leading some to believe that OS X could be set to fall in line.

However, as 9to5Mac points out, there are good reasons to remain skeptical that the change indicates an imminent rebrand.

Apple developers often use macOS identifiers for convenience, because the naming scheme suffix shares symmetry with Apple's other platforms and allows coders to easily identify apps with cross-platform components. Additionally, a significant rebrand of Apple's flagship desktop OS is the type of marketing decision that engineering teams would be unlikely to hear about until later on in the version cycle.

Despite the skepticism, a rebrand for OS X is by no means out of the question. Indeed, the name change would see Apple revert to the operating system's traditional name Mac OS, which remained in place until Apple dropped 'Mac' from its OS X branding in 2012.

The next version of Apple's Mac operating system, 10.12, is rumored to include Siri as a desktop feature, and is expected to be revealed at the Worldwide Developers Conference in June ahead of a public launch in the fall.

Update: The file is actually not new in OS X 10.11.4, as it is present on machines running older versions of OS X El Capitan and lists a creation date of August 2015.

Related Forum: macOS Sierra

Top Rated Comments

iZac Avatar
127 months ago
Hands up who still pronounces it "OS EX" despite knowing full well that it's "OS TEN"?

*raises hand*
Score: 37 Votes (Like | Disagree)
Ballis Avatar
127 months ago
So people are actually named Rambo? Thats awesome!
Score: 16 Votes (Like | Disagree)
rudychidiac Avatar
127 months ago
macos tacos
Score: 8 Votes (Like | Disagree)
JosephAW Avatar
127 months ago
Apple will rebrand OSX and use macOS when they roll out the new iMacs using the A10 desktop processors as they fade out the use of x86 chipset.
Score: 6 Votes (Like | Disagree)
Xeyad Avatar
127 months ago
Now bring back the Happy Mac! Am I too old that I remember this back when I had Mac System 6.0 on my Macintosh LC III?

Score: 5 Votes (Like | Disagree)
bbeagle Avatar
127 months ago
Bring back the Apple key on the keyboards! I have a Macbook Pro, and I'm still using an external keyboard that has the Apple key. When I use the laptop by itself, there is no Apple key. Small thing, but I wish it was still there.

Score: 5 Votes (Like | Disagree)

Popular Stories

iphone 17 models

No iPhone 18 Launch This Year, Reports Suggest

Thursday January 1, 2026 8:43 am PST by
Apple is not expected to release a standard iPhone 18 model this year, according to a growing number of reports that suggest the company is planning a significant change to its long-standing annual iPhone launch cycle. Despite the immense success of the iPhone 17 in 2025, the iPhone 18 is not expected to arrive until the spring of 2027, leaving the iPhone 17 in the lineup as the latest...
duolingo ad live activity

Duolingo Used iPhone's Dynamic Island to Display Ads, Violating Apple Design Guidelines

Friday January 2, 2026 1:36 pm PST by
Language learning app Duolingo has apparently been using the iPhone's Live Activity feature to display ads on the Lock Screen and the Dynamic Island, which violates Apple's design guidelines. According to multiple reports on Reddit, the Duolingo app has been displaying an ad for a "Super offer," which is Duolingo's paid subscription option. Apple's guidelines for Live Activity state that...
Clicks Communicator Feature

'Clicks Communicator' Unveiled — Will You Carry This With Your iPhone?

Friday January 2, 2026 6:35 am PST by
The company behind the BlackBerry-like Clicks Keyboard accessory for the iPhone today unveiled a new Android 16 smartphone called the Clicks Communicator. The purpose-built device is designed to be used as a second phone alongside your iPhone, with the intended focus being communication over content consumption. It runs a custom Android launcher that offers a curated selection of messaging...
apple intelligence black

Report: Apple's AI Strategy Could Finally Pay Off in 2026

Tuesday December 30, 2025 9:01 am PST by
Apple's restrained artificial intelligence strategy may pay off in 2026 amid the arrival of a revamped Siri and concerns around the AI market "bubble" bursting, The Information argues. The speculative report notes that Apple has taken a restrained approach with AI innovations compared with peers such as OpenAI, Google, and Meta, which are investing hundreds of billions of dollars in data...
apple fitness 2026 1

Apple Teases 'Something Big' Coming Soon to Apple Fitness+

Tuesday December 30, 2025 2:11 pm PST by
The Apple Fitness+ Instagram account today teased that the service has "big plans" for 2026. In a video, several Apple Fitness+ trainers are shown holding up newspapers with headlines related to Apple Fitness+. What's Apple Fitness+ Planning for the New Year? Something Big is Coming to Apple Fitness+ The Countdown Begins. Apple Fitness+ 2026 is Almost Here 2026 Plans Still Under ...
Mac Pro Feature Blue

What's Happening With the Mac Pro?

Wednesday December 31, 2025 9:59 am PST by
Apple hasn't updated the Mac Pro since 2023, and according to recent rumors, there's no update coming in the near future. In fact, Apple might be finished with the Mac Pro. Bloomberg recently said that the Mac Pro is "on the back burner" and has been "largely written off" by Apple. Apple apparently views the more compact Mac Studio as the ideal high-end pro-level desktop, and it has almost...
macbook air march 2020

Apple Says Final Intel MacBook Air and Apple Watch Series 5 Now 'Vintage'

Wednesday December 31, 2025 8:39 am PST by
Apple today added the final 13-inch MacBook Air powered by Intel processors, the Apple Watch Series 5, and additional products to its vintage products list. The iPhone 11 Pro was also added to the list after the iPhone 11 Pro Max was added back in September. The full list of products added to Apple's vintage and obsolete list today: MacBook Air (Retina, 13-inch, 2020) iPhone 8 Plus 128GB ...
Apple Fitness Plus hero

Apple Announces New Fitness+ Workout Programs, Strava Challenge, and More

Friday January 2, 2026 6:43 am PST by
Apple today announced a number of updates to Apple Fitness+ and activity with the Apple Watch. The key announcements include: New Year limited-edition award: Users can win the award by closing all three Activity Rings for seven days in a row in January. "Quit Quitting" Strava challenge: Available in Strava throughout January, users who log 12 workouts anytime in the month will win an ...