Traditionally, the adjective form and demonym of the city of Waterdeep [has been "Waterdhavian"][1]. It's spelled that way [across many D&D 5E books][2], including the *Sword Coast Adventurer's Guide*, many hardcover adventures, and novels like *Death Masks*.

However, in the lastest Waterdeep published adventures (*Dragon Heist* and *Dungeon of the Mad Mage*), it's [spelled "Waterdavian" throughout][3], without the "h". I'm assuming that it's not just some error in editing, since it's consistent throughout these newer books.

Is this an "official" change in spelling that I should be adopting? In particular, the current [Forgotten Realms style guide][4] that I can find still uses the "h", and I don't know if there's an update to it available somewhere. Also, does it represent some in-universe revision to how the word is spelled (in the "Common" language I suppose)?


  [1]: https://rpg.stackexchange.com/questions/129734/what-is-the-in-universe-explanation-for-waterdhavian-being-the-adjectival-form
  [2]: https://www.dndbeyond.com/search?q=waterdhavian
  [3]: https://www.dndbeyond.com/search?q=waterdavian
  [4]: https://www.dmsguild.com/product/267467/DMs-Guild-Creator-Resource--Style-Guide-Resources