Surnames Categorized "rivers"

This is a list of surnames in which the categories include rivers.
Ayers 3 English
Indicated a person from the town of Ayr in Scotland. The town was named for the river that flows through it, itself derived from an Indo-European root meaning "water".
Crawford English
From a place name derived from Old English crawa "crow" and ford "river crossing".
Trent English
Denoted one who lived near the River Trent in England.