The name of Apple's first foldable is giving some people déjà vu. While the device isn't groundbreaking — foldable phones have been around for some time in the Android space — it marks a shift for Apple. But alongside the features and sleek design, people are especially focused on the name.

While you might not think the word 'Duo' as part of the moniker would be controversial, many point out that it's the name Microsoft used with its Surface Duo foldable products. A history of Apple Duo dates back to 1992 with the Apple Power Book Duo. The laptop-style computer was produced through 1997 and could connect to an accessory called the Duo Dock to become a full-fledged desktop.

Furthermore, when you explore Apple's trademarks, the company now owns the trademark for iPhone Duo, its list also interestingly includes Mag Safe Duo Charger. This dual charger, introduced back in 2020, is designed to wirelessly charge two Apple devices simultaneously. Microsoft's Duo history spans from the Surface Duo launch in 2020 to Surface Duo 2 a year later.

Though the Duo name was used by Microsoft years ago, it was for a failed line that has long been discontinued. Microsoft scrapped the Surface Duo 3 in 2023, and had plans for another foldable that never materialized. These products don't have a legacy such that Apple is stealing the name. iPhone Duo might not be the first Duo foldable, but it will likely be much better received than the older one.