This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 倰 is uncertain. It combines the person radical 亻 with 夌, but the original meaning and component function are unclear.
With no clear meaning, focus on the shape: a person 亻 beside 夌, which looks like a mound or ridge. Remember it as a rare kanji with an uncertain sense.
For リョウ, imagine a person named Ryo standing beside a mound: Ryo -> リョウ, and the person radical 亻 is next to the mound-like 夌.