This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
馦 combines 香 (fragrance) with 兼, but the exact historical development and original meaning are uncertain.
With 香 (fragrance) on the left, 馦 likely relates to scent, but its precise meaning is unclear. Picture a mysterious aromatic plant with the 兼 shape as its leaves.
For ケン, imagine a can of fragrant incense: can -> ケン, and the 香 component reinforces the scent.