Surnames Categorized "underwater"

This is a list of surnames in which the categories include underwater.
Ćosić Croatian, Serbian
From Croatian and Serbian ćosav "beardless", ultimately from Persian کوسه (koseh) meaning "shark".
Ely English
From the name of a town in eastern England meaning "eel district".
Krebs German
Means "crab" in German, perhaps a nickname for a person with a crab-like walk.
Nicchi Italian
From the Italian word nicchio meaning "shell", possibly a nickname for people related to the sea.
Pollock Scottish
From the name of a place in Renfrewshire, Scotland, derived from a diminutive of Gaelic poll meaning "pool, pond, bog". A famous bearer was the American artist Jackson Pollock (1912-1956).