This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
飅 is a rare character composed of the wind radical 風 enclosing 畱. The exact historical development is uncertain, and it may be a variant or non-standard form.
The wind enclosure 風 wraps around a dense inner shape, suggesting something carried or moved by the wind, but the exact meaning is unclear.
For リュウ, imagine a rare wind spirit named Ryuu swirling inside the 風 enclosure: Ryuu -> リュウ.