Plausible word name, denoting strength and stability. 

Anchor

Alee

One of the most usable of the pleasant, newly adopted nature/water names (like Lake and Ocean), especially in middle position. 
 There was a character named Bay Kennish on the show Switched at Birth; conservative political commentator Bay Buchanan was born Angela Marie.
 Other associations with bay are the bay laurel tree, prized since ancient times for its medicinal and culinary (bay leaves!) properties, and the reddish-brown color usually applied to horses.

With the tide coming in on a new wave of word names, this one just might catch on, especially for parents who relish sun, sand, and surf. Forest lovers can spell it Beech, like the tree. 

Beach

Bimini

Boomer

Bowline

Buoy

Burgee

Captain

Channel

Cleat

Clipper

Cuddy

Cutter

Dagger is one of the new <a href="https://nameberry.com/list/404/badass-baby-names">badass baby names</a>, a sharp and scary choice that some parents may feel arm their child for battle in a cruel modern world.

Dagger

A Dorothy nickname name with a measure of nostalgic charm. Kids will associate it with the funny fish character voiced by Ellen DeGeneres in the Pixar animated instant classic Finding Nemo.

Dory

Dinghy

Fender

Fetch

When Gail was popular, half a century ago, Gale was a plausible choice.  Gale does put a slightly more masculine spin on the name, but it's dated in any version.

Gale

One of the newer geographical site names, it has the advantage of sounding like a real girl's name because of its jen beginning and feminine a ending. 

Genoa

The charming Hitch played by Will Smith in the eponymous movie put this into the lexicon. Also known as the nickname of director Alfred Hitchcock and writer Christopher Hitchens, who titled his autobiography "Hitch." 

Hitch

Halyard

Hatch

Holly

Hull

Ketch

Knot

A name that has a bit of a shouldn't-I-be-a-middle-name sound, though still in use as a first for both genders. Lee might be a good choice if you want something that sounds at once traditional yet modern, unisex but not newly-minted. And while it absolutely works as a first name, Lee is still one of the top <a href="https://nameberry.com/list/480/middle-names-for-boys">middle names for boys</a> as well as one of the <a href="https://nameberry.com/blog/top-last-names-in-the-us">most common last names in the US</a>.

Lanyard

Luff

This pretty sea-born name was used to dramatic effect by Shakespeare in his play Pericles for the virtuous princess who says she is "Call'd Marina, for I was born at sea." Marina was an epithet of Venus, and there was more than one saint of that name. It was used in Britain from as early as the fourteenth century.
 Although it reached as high as Number 219 in 1994, Marina never had the trendy feel of cousins Melissa and Marissa. It's now very popular in Spain.
 A prominent current bearer is Marina Abramovic, widely publicized New York-based Serbian performance artist. And actor Matt LeBlanc chose the name for his daughter, Marina Pearl.

Marina

Mast

Mate

Mizzen

Singer Nivea used this unusual color/seafaring name for her daughter, but it has possibilities for a boy too.

Navy

Port

Paddle

Pirate

Prop

New, fast, cool, and chosen by director Robert Rodriguez, whose other sons are Rebel, Rocket, and Rogue, all somewhat risky options. 

Lara Bingle and Sam Worthington are also parents to sons named Racer and Rocket.

Racer

Radar

Reach

Rigger

Rudder

A word name that has sailed onto birth certificates of both genders, especially since Liv Tyler used it for her son.  For boys, Saylor and Sailor are used about equally, but were together given to about 100 baby boys last year....and 1000 baby girls.

Sailor

Schooner

Scupper

Scuttle

Skeg

Skiff

Skipper/ skippy

Sloop

Sonar

Spar

Splash

Teak

Tender

Tiller

Transom

Trim

Wake

Zodiac

Zulu

liney143's list "Boat related names" of 68 great name ideas: Anchor - Zulu!

Boat related names

Could be used for pets (dogs, cats, fish) or as unusual middle and/or first names for babies.