Where does “鱟” come from?

鱟 (Chinese) comes from Chinese 雩, from Chinese 雨, from Proto-Sino-Tibetan *rV-waʔ — rain.

Ancestry of “鱟”, step by step

StepLanguageWordMeaning
1Chinese雩—
2Chinese雨—
3Proto-Sino-Tibetan*rV-waʔrain
Every word from Proto-Sino-Tibetan *rV-waʔ →Every word from Chinese 雨 →Every word from Chinese 雩 →