According to Lichess, the Hübsch gambit starts with 1. d4 Nf6 2. Nc3 d5 3. e4:
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"] 1. d4 Nf6 2. Nc3 d5 3. e4
This article states:
Second, despite being named in honor of an unknown player, Hübsch, who achieved a spirited victory in 1922 with the White pieces over the renowned Saviely Tartakower [...]
Who was this Mr(s) Hübsch, does anyone have any further information?
Edit: this article claims that his/her name starts with "E".
Edit: Another page claims that the first name starts with an "F".
Edit: the video description of this video cites a book and the following text:
On December 20, 1922, an unknown young man entered the chess room at the Café Central, walked straight up to Grandmaster Tartakower, who was sitting idly by, and challenged him to a game of chess for a high stake. (DeepL translation)