I've seen & heard it spelled & written as such before. Maybe I'm just following the usual American-English manner of "mutilating" any pure forms of a foreign word/term.
but you're right: it is YHWH...or am I supposed to leave out the W.
Anyway, I was just spelling it the way I'd heard it pronounced.
There is good reason to believe YHWH was pronounced "Yahweh" (i.e. ancient Greek did it iabe or iao).
There is no rational basis for objecting to adding vowels -- unless one will also insist on dropping Abraham for 'brhm, or Jacob for y`qb, and so forth.