This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 玐 is uncertain. It visually combines 王 (jade/king) and 八 (eight), but the original meaning and component relationship are unclear.
With no clear meaning, picture a mysterious jade artifact (王) marked with the number eight (八). Its purpose is unknown, so its meaning remains uncertain.
For ハツ, imagine a rare jade piece (王) with an eight (八) carved on it, and someone exclaims "Hats!" (like a sharp, invented sound) when they discover it: Hats -> ハツ.