This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
簥 combines 竹 (bamboo) with 喬, which likely contributes the sound. The exact historical development is uncertain.
The top 竹 suggests bamboo, and the bottom 喬 is a tall shape. Picture a tall bamboo object, but its exact meaning is uncertain.
For キョウ, imagine a tall bamboo (竹) in Kyoto (キョウト): Kyoto -> キョウ, and the tall bamboo stands in the ancient capital.
—