This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鷮 is uncertain. It combines 喬 (tall) with 鳥 (bird), likely referring to a kind of bird, but the specific origin is unclear.
A tall bird (喬 suggests height) with the bird radical 鳥. Imagine a long-legged bird standing tall, but its exact identity is a mystery.
For キョウ, picture a tall bird in Kyoto (キョウト) standing beside a bridge: Kyoto -> キョウ, and the tall bird watches over the city.