餘杭

Etymology
Probably an Old Chinese transcription of an original Baiyue name, but folk etymologized as deriving from.

considers to be derived from a  substrate word. Compare 🇨🇬, whence 🇨🇬 and 🇨🇬. Alternatively, suggests it may be derived from 🇨🇬, whence 🇨🇬, 🇨🇬, 🇨🇬.