Reading through some different @Wizards_DnD books shows some differences in spelling.

Is it 'Waterdavian' or 'Waterdhavian?'@ChrisPerkinsDnD @JamesIntrocaso

(this is a largely unimportant question, I'm just curious)

— Human Spice Latte (@TheOtherTracy) September 14, 2018

Language (spoken AND written) changes, in the real world and the Realms. (Cormyrean, Cormyrian, and Cormyte are all in use, right now). That's what's happened here, too. (Says the guy who came up with "hin" long ago, because search-and-replacing "halflings" with it let me…

— Ed Greenwood (@TheEdVerse) September 14, 2018

Yep.
I saw the early playtest text of Dragon Heist, and didn't even mention it. As I figure we literally all got at least a third of a page more of useful gaming text as a result of excising the 'h'. ;}

— Ed Greenwood (@TheEdVerse) September 14, 2018

I’m going to interpret that as “I prefer it with an “h” also…but it’s alright”. 🙂