This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
凕 combines the ice radical 冫 with 冥, which likely contributes sound. The exact historical development is uncertain.
The ice radical 冫 suggests coldness, and 冥 can suggest darkness or obscurity. Imagine a dark, frozen landscape where meaning is hard to grasp.
For ベイ, picture a frozen bay where the ice radical 冫 meets dark water: bay -> ベイ.