mythological snail goddess
媧 refers to a mythological snail goddess, a specific figure from Chinese legend. The meaning is narrow and tied to that single mythological reference.
媧 combines 女 (woman) with 咼, which likely contributes the sound. The character was created to name the mythological goddess Nüwa (女媧), often associated with creation and sometimes depicted with a snail-like body.
The woman radical 女 beside 咼 suggests a female figure. Picture a goddess emerging from a spiral snail shell, her form half-woman, half-snail.
For カイ, imagine the snail goddess gliding over calm kai (海, sea) waters: kai -> カイ, and the sea snail goddess rules the shore.
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Nüwa (mother goddess of Chinese mythology); Nügua