In the "Search" box, type in both the words "water" and "sea".
Select the "search in meanings" choice directly below and to the left.
Select the "find masculine names only" choice to the right.
Click on the "Search" button.
Is there a reason why you're looking for masculine names having something to do with the sea? Is there a particular ethnicity that you're aiming for? If you could give me some more info as to what you want, I'll see what I might be able to dig up for you.