This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
琄 combines 王 (jade) with 肙, which likely contributes the sound. The exact historical development is uncertain.
The left side is 王 (jade), and the right side is 肙 (a small worm). Picture a jade ornament shaped like a tiny worm, but remember its meaning is unclear.
For ケン, imagine a jade ornament shaped like a tiny worm being examined by Ken: Ken -> ケン, and Ken studies the uncertain jade piece.