New
#390
Mike, the last recognizable code name was Redstone 5, Version 1809 (OS Build 17763.404), which is basically, the October 2018 Update. That's it; no more code names.
As an Insider, I'm testing 19H1, Version 1903 (OS Build 18632.1). 19H1 translated is first half of [20]19. There is no Redstone or anything else resembling a code name except for 19H1.
As an Insider, I'm also testing 20H1, Skip Ahead Version 1903 (OS Build 18865.1) which should be the April 2020 Update.