This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 佒 is uncertain. It visually combines 亻 (person) with 央, but the original role of 央 here is unclear.
With no clear meaning, focus on the shape: a person 亻 beside 央, like someone standing next to a central marker.
For ヨウ, imagine a person 亻 standing in the center 央 and calling out 'Yo!' to get attention: Yo -> ヨウ.