This is a list of surnames in which the categories include underwater.
ĆosićCroatian, Serbian From Croatian and Serbian ćosav"beardless", ultimately from Persian کوسه (koseh) meaning "shark".
ElyEnglish From the name of a town in eastern England meaning "eel district".
KrebsGerman Means "crab" in German, perhaps a nickname for a person with a crab-like walk.
NicchiItalian From the Italian word nicchio meaning "shell", possibly a nickname for people related to the sea.
PollockScottish 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).