This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
瑍 combines 王 (jade) with 奐, which likely contributes the sound. The exact historical development is uncertain.
The left side is 王 (jade), and the right side is 奐. Without a clear meaning, picture a mysterious jade artifact with an unknown name.
For カン, imagine a can made of jade: can -> カン, and the jade can is the mysterious object.