This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鋣 combines 金 (metal) with 邪, which likely contributes the sound. The exact historical development is uncertain.
The metal radical 金 suggests something made of metal, but the overall meaning is unclear. Imagine an ancient, mysterious metal tool whose name has been forgotten.
For ヤ, picture a yak carrying a mysterious metal object: yak -> ヤ, and the metal thing remains unknown.
—