AzureOps has a nice ring to it! With regards to VSTS, I probably just have a soft spot for Visual Studio itself.
The name made a lot more sense back in the day when the premier client was actually the Visual Studio IDE. But today, most people interact with Azure DevOps with their browser and too many people think "Visual Studio Team Services" is a web-based IDE.
The name change is bittersweet. We've been "Visual Studio <something>" since the first release of our on-premises product, well over a decade ago. But I'm confident about this next phase of Azure DevOps.