The April 2019 release of Windows client, codenamed Windows 10 19H1, is not using the Azure naming convention. But the release after 19H1 -- due around October 2019 or so -- will, my sources say.
The Azure team uses the elements for codenames. The current Azure codename for the 19H1 deliverables is "Titanium," (Ti) I hear, but the Windows client team didn't end up using that, as they'd already started employing internally and externally "19H1."
The Windows 10 feature release that some of us were expecting to be called 19H2 will actually be called "Vanadium," (V) my contacts say, in keeping with the Azure naming scheme. If the team sticks with the order of the table of elements, the first Windows feature release in 2020 would be called "Chromium" (Cr). Obviously, that could create for more than a bit of confusion, given Google's use of that term. As a result, I'm hearing the team is likely going with a made-up element name for that release, likely "Vibranium." (Vibranium is what Captain America's shield is made out of, as I've been schooled.)
I've asked Microsoft to confirm the Vanadium and Vibranium codenames for the coming releases of Windows, but no word back so far. (I'm not holding my breath.) Update: A spokesperson said Microsoft had no comment.
A quick refresher on the Windows 10 feature update codenames to date: