This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
詃 combines 言 (speech) with 玄, which likely contributes the sound. The exact historical development is uncertain.
With 言 (words) and 玄 (mysterious), imagine mysterious words that might lure or deceive, but remember the meaning is uncertain.
For ケン, imagine a mysterious Ken speaking words that lure you: Ken -> ケン.