This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
嵺 combines 山 (mountain) with 翏, which likely contributes a phonetic element. The exact historical development is uncertain.
The left side is a mountain 山, and the right side 翏 looks like feathers 羽 with decorative strokes. Picture a remote mountain peak where rare birds leave their feathers, but the meaning remains unclear.
For コウ, imagine a lone mountain peak echoing with a deep, resonant sound: 'Koh...' The sound 'Koh' cues コウ, and the mountain 山 ties it to the kanji's shape.