Sabrina is linked to the River Severn in England, either through being the Goddess of the Severn, or being a nymph [YAY YAY YAY I'M A BEAUTIFUL NYMPH HAHAHA](also known as Hafren) who drowned in Severn, and so gave it her name. It is more likely that the character derived her name from the river, rather than the river deriving its name from her.
Of uncertain etymology, Sabrina is believed to be of Celtic origin, as it is borne in Celtic mythology by an illegitimate daughter of the Welsh king Locrine. The child was ordered drowned by the king's wife, Gwendolen, thus giving her name to the river in which the foul deed took place. Latin writings of the 1st century list the river's name as Sabrina, but it is now known as the Severn.
