This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
譞 combines 言 (speech) with 睘, which likely contributes the sound. The exact historical development is uncertain.
The left side is 言 (words), and the right side 睘 looks complex. Without a clear meaning, picture a mysterious ancient scroll with elaborate speech symbols.
For ケン, imagine a wise person named Ken deciphering the mysterious speech scroll: Ken -> ケン.