Re: Time to rename it and make it just part of the Entra brand
But the people who know still call IBM Spectrum Protect by the name Tivoli Storage Manager. And many of the underlying tools still start have references to the previous incarnation, Adstar Distributed Storage Manager (ADSM).
Ditto Spectrum Scale (aka GPFS, or MMFS [Multi-Media File System], or even TigerShark [some tools are still called ts...]), and System Mirror PowerHA (HACMP). Names tend to persist in technical circles.
When talking about documentation, unless Microsoft is going to tear through the API, you can probably get away with a comment in the introduction to your documentation, at least in the short term, along the lines of "The product previously known as Azure AD has been renamed by Microsoft as Entra. For all references to Azure AD, read Entra."
The only time I use an IBM tool's 'proper' name is when I'm talking to a marketing or licensing droid.