Alcyone was the wife of Ceyx, but the happy pair angered the gods by calling each other Zeus and Hera.  Ceyx's ship was sunk, Alcyone hurled herself into the sea, but then in sympathy for their grief the gods made the lovers halcyon birds or kingfishers.

Alcyone

Ariel is a male Biblical name, seen there as the messenger of Ezra, and also used as a symbolic name for the city of Jerusalem, while Shakespeare used it for a (male) sprite in The Tempest.
 For girls, Ariel enjoyed a considerable burst of popularity with the 1989 release of Disney's The Little Mermaid: in 1991 it peaked at #66. 
 Although its wave has crested, Ariel is still a name any little girl would love. It is also associated with the poetry of Sylvia Plath and with the Chilean-American writer Ariel Dorfman. The popular historian Ariel Durant was born Ida Ariel Ethel.
 In Israel, Ariel is used as much or more for boys, but in the US, more than three times as many baby girls as boys are named Ariel. Read more about Ariel and other <a href="https://nameberry.com/blog/disney-princess-names">Disney Princess Names</a> in our featured blog.

Ariel

Aedre

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.

A slow and sultry southern choice that's definitely cool for babies of either gender. While the word feels French and has its roots in 18th century French Louisiana, it derives from the Choctaw word bayuk, which means "small stream."

Bayou

Brooke has long projected an aura of sleek sophistication, and can also be seen as a stylish water name.
 It was Brooke Shields (born Christa) who took it from quietly fashionable to ultra trendy when she was just a young girl; socialite Brooke (born Roberta Brooke) Astor gave it social status. 
 Brookes have appeared on soaps like The Bold and the Beautiful" and All My Children, and on Melrose Place and One Tree Hill.
Chynna Phillips and Billy Baldwin have a daughter named Brooke.

Brooke

Cordelia is exactly the kind of old-fashioned, grown-up name for girls that many parents are seeking for their daughters today. The name of King Lear's one sympathetic daughter, Cordelia has both style and substance along with its Shakespearean pedigree.
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Cordelia is a Nameberry favorite—Number 106 on the site—and it reentered the US Top 1000 in 2014 after a 60+ year absence. By 2016 it sank below that line again, must to the relief of many Cordelia fans who feared the name would get too popular.
 
If you're torn between Cordelia and the equally lovely Cora, you can always choose Cordelia for long and then call her Cora for short—or Delia, Lia, Del, or even the extremely different Cordie.
 Cordelia also appeared in Evelyn Waugh's Brideshead Revisited, Margaret Atwood's Cat's Eye, as detective Cordelia Gray in P.D. James's mystery novels, and was promoted by a character on both Buffy the Vampire Slayer and its spin-off Angel.
 And then there's that quote from the heroine of Anne of Green Gables: "I would love to be called Cordelia. It's such a perfectly elegant name."

Cordelia

Caspian

Like Violet, Lavender and Lilac, Ianthe is a purple flower name. Chosen by the poet Shelley for his daughter, Ianthe has a poetic, romantic, almost ethereal quality. In the ancient myth, she was the daughter of Oceanus, supreme ruler of the sea, and also a Cretan woman so beautiful that when she died the Gods made purple flowers grow around her grave.
 Iantha is also used.
 Ianthe was a favorite of the pastoral poets of the seventeenth century and then again in the early nineteenth. She appears in the works of Shelley, Barbara Pym and Georgette Heyer. Writer Richard Brautigan named his daughter Ianthe.

Ianthe

Margaret is derived from the French Marguerite, which in turn came from Margarita, the Latin form of the Greek Margarites. Margarites was based on the Old Persian word margārīta, meaning "pearl." 
 
Margaret has been one of the most Christian and royal of <a href="https://nameberry.com/girls-names">female names</a>—attached to the patron saint of women in childbirth and to various queens and princesses in England, Scandinavia, Austria, and the Netherlands, and to the first female prime minister of Great Britain, Margaret Thatcher.
 
Margaret is a rich, classic name used for queens and saints. Margaret was replaced for decades by less starchy forms like Maggie and Meg, but some stylish parents are reviving Margaret in full, attracted by its strong sound and classic status, as an alternative to Elizabeth or Katherine. 
 
Margaret is also an important family name for many people, having ranked near the top through the first half of the 1900s. An extremely well used name since medieval times, Margaret is still considered the Scottish national name.
 
If you're honoring an ancestral Margaret, there are many fresh and new alternatives, from the French Marguerite—very stylish in Paris—to the diminutive Margo (or Margot). In French, Marguerite is another word for daisy, making Daisy another appropriate Margaret short form or honorific, as is Maisie. Other offspring of Margaret include Madge, Marjorie/Margery, Megan, Molly, Polly, Peggy, Greta, and Rita.

Margaret

Marin is a lovely county north of San Francisco, and a lovely baby name on the rise, one which sounds more refreshing than the more familiar Marina.
 As a place-name, Marin is pronounced with the accent on the second syllable, Ma-RIN, sort of like Marie, though when used as a name, many would say MAR-in, to rhyme with Karen.
 Marin is unisex in several European countries (in Croatia it's currently Number 29 for boys); Maren is an alternate, Scandinavian, spelling. In France a very fashionable alternative for girls is Marine.

Marin

Maris is an unusual and appealing name that has never appeared in the U.S. Top 1000, overshadowed by its twentieth century elaboration, Marisa/Marissa. It derives from the phrase "Stella Maris," star of the sea, one of the many epithets of the Virgin Mary, and became familiar via the unseen (but unliked) character of sitcom Frasier's ex-sister-in-law.
 
As a surname, Maris is associated with legendary NY Yankee, Roger Maris.

Maris

Mary is the English form of Maria, which ultimately was derived from the Hebrew name Maryam/Mariam. The original meaning of Maryam is uncertain, but theories include "drop of the sea" (from Hebrew roots mar "drop" and yam "sea"); "bitter" (from Hebrew marah "bitterness"); and "beloved" (from the Egyptian root mr).

 Mary, the quintessential New Testament name, was #1 for girls until the mid-twentieth century. Though still popular, Mary is used now mostly for religious or family reasons. If it's style you're after, Mary's many diminutives and derivatives such as Maire, Mamie, May, Mitzi, Molly, Maura, Marietta, and even Maria may seem more fashionable. 

 Mary was the most popular and enduring female Christian name in the English-speaking world (as were Maria and Marie in Spanish and French) until the 1940s. That was when in the US Mary was finally dethroned by such trendy upstarts as Linda and Karen.

 There are six Marys in the Bible, including the Virgin Mary, Mary Magdalene, Mary the sister of Martha and Lazarus, Mary the mother of James and Joseph, and Mary the mother of Mark, and there have been British royal Marys beginning in the sixteenth century. In earlier times Mary was considered too sacred to be used; it finally gained usage in England in the twelfth century, and by the sixteenth had blanketed the female population, to the point where dozens of pet forms had to be contrived to distinguish one Mary in the family from the others.

 The poet Byron deemed Mary a "magic" name, and Bing Crosby proclaimed it "a grand old name." Mary has always been a good-girl name, as reflected by such mid-century icons of propriety and wholesomeness as Mary Poppins and Mary Tyler Moore. The lovely Lady Mary Crawley of Downton Abbey has restored some freshness to the name.

 Among the celebs who dropped their birth name of Mary are Meryl Streep, Debbie Reynolds, and Lily Tomlin.

 For more detail on the origins and possible meanings of the name Mary, see this <a href="https://nameberry.com/blog/in-search-of-the-meaning-of-mary">excellent post on the subject</a>.

Mary

Meris

Possibility for a girl born under one of the water signs -- Cancer, Pisces, or Scorpio. 

Naida

When R & B singer Nivea made this highly original choice for her daughter's name, she claimed to have thought of it in terms of the color and not the seagoing armed service. You can look at it either way.

Navy

Cool, serene name of the Egyptian river can make a fresh choice for a girl.  The origin of river name Nile relates to the Arabic and ancient Hebrew word for dark blue or indigo; in ancient Egyptian, its literal meaning is river.

Nile

Nausicaa

Nesse

Nireta

Ocean is a nature name that comes right out and states its meaning and association. Full of power and depth, Ocean is one of the fastest-rising baby names for both girls and boys, making the US Top 1000 for both genders in 2021. Oceane, the version that's trendy in France, was used for only 11 baby girls in the US in the same year.

Ocean-lovers who want to be less obvious can choose such subtler <a href="https://nameberry.com/list/641/names-that-mean-ocean">names that mean ocean</a> as Jennifer or Marissa, but coming right out and using Ocean is a perfectly valid way to go.

Ocean

Pearl, like Ruby, has begun to be polished up for a new generation of fashionable children after a century of jewelry box storage. The birthstone for the month of June, Pearl could also make a fresher middle name alternative to the overused Rose. Cool couple Maya Rudolph and Paul Thomas Anderson named their daughter Pearl Minnie, followed by Jack Osbourne, and several celebs have put it in the middle spot, as in Busy Philipps's Cricket Pearl, Jake Owen's Olive Pearl and Caleb Followill's Dixie Pearl .
After being a Top 25 name in the late nineteenth century, Pearl went into a long slide, but is showing signs of a strong comeback -- it reentered the Top 1000 in 2010.
 In Nathaniel Hawthorne's The Scarlet Letter, Pearl is the illegitimate daughter of Hester Prynne, who gives her the name because she is 'her mother's only treasure.'
 Pearl was also the alter ego name of Janis Joplin, tied to singer Pearl Bailey, and---hmm--the birth name of western writer Zane Gray.
 Variations are PERLE and PERLA.

Pearl

Rillia

Talia is derived from the Hebrew elements tal, meaning "dew," and yah, in reference to God. In the mythology of one ancient sect, Talia was one of ten angels who attended the sun on its daily course. The occasionally homophonous name Thalia has unrelated Greek origins.
 
In tandem with the longer-form Natalia, this pretty Russian-flavored girls’ name has been rising in the popularity charts in the US.
 
A prominent bearer is Talia Shire, doomed to go down in cinema history as Rocky's mousy girlfriend Adrienne, along with actress Talia Balsam, aka the former Mrs. George Clooney. Most recently, Talia was attributed to YouTube star Talia Joy Castellano, a young girl battling cancer who passed away at age 13.
 
Talia is also an Australian Aboriginal name meaning "near water".

Talia

Talise

Tora is the female version of Tor or Thor, the name of the Norse god of thunder. Actress Jeanne Tripplehorn chose it for her daughter. 

Tora

Torlan

Ula is among the unusual U names that may have a range of origins and meanings, from the Celtic one given here to its possibilities as a short form of Eulalia or Ursula.  Ulla is a Scandinavian name usually an abbreviation of Ursula or Ulrika.

tea-rose's list "Mermaid - Underwater Names" of 28 great name ideas: Alcyone - Ula!

Mermaid - Underwater Names

A short list of a few of my favorite mermaid / water-related names for girls.