surname
瞿 is a rare kanji primarily used as a surname. Its standalone meaning is unclear, though it can appear in compounds related to looking or fear.
The exact historical development of 瞿 is uncertain. It visually combines 䀠 (a doubled eye) with 隹 (a short-tailed bird), but the original meaning and component function are unclear.
The top part 䀠 looks like two wide-open eyes, and the bottom 隹 suggests a bird. Imagine a bird staring with big eyes, which could relate to looking or being startled—but as a surname, just remember it as a name character.
For ク, picture a cool bird with big eyes: cool -> ク, and the bird's stare makes you remember the reading.