surround
遶 centers on the idea of encircling or going around something: to surround or revolve around.
遶 combines the movement radical 辶 with 堯, which likely contributes the sound and possibly the idea of high or winding, suggesting movement that goes around.
The movement radical 辶 wraps around the tall 堯 shape, like a path that encircles a high mound. Picture a road that surrounds a hill.
For ニョウ, imagine a new road that surrounds the old town: new -> ニュウ is close, but adjust to ニョウ by thinking of a 'nyo' sound as the road curves around.