997+ Unique, Rare, and Unusual Girl Names

Cressida is a pretty mythological and Shakespearean heroine name much better known in Britain than it is here — an imbalance the adventurous baby namer might want to correct.

Rue has gone from Golden Girls actress to Hunger Games heroine. This botanical name is also a coincidental double word name, meaning "regret" in English and "street in" French. Despite these unfortunate secondary meanings, Rue has real potential to be one of the most popular new middle names for girls.

This lively Old Testament nature name (belonging to one of the three beautiful daughters of Job) may be missing from the current US Top 1000 list, but it ranks highly here on Nameberry — making it one to watch!

Arwen is well known as princess of the Elves in Tolkien's Lord of the Rings. The author took inspiration from Welsh for many of his character names, and indeed Arwen and its masculine counterpart Arwyn do have a modest history of use as legitimate Welsh names, deriving from the -wyn suffix ("fair, blessed") plus an intensifying prefix.

This form of Agnes, Ines has always been popular since the true story of the thwarted lovers Queen Ines of Castro and King Peter of Portugal. This has to be one of the most heartbreaking and bloody true romances in history!

Harriet has long been considered a stylish, upscale name in England, but it's still waiting to be revived in the US—though some parents seeking a solid, serious semi-classic are beginning to consider it.

This Welsh nature name that can be pronounced exactly like the male Ira. Or, to avoid confusion, you could just name her Snow.

Cecily is as dainty as a lace handkerchief. Cecily has a wide assortment of namesakes. One Cecily was the mother of King Richard III, whose beauty gained her the title "the Rose of Raby," Cecily Parsley is a Beatrix Potter bunny, Cecily Cardew is a character in The Importance of Being Earnest, and the author of the Gossip Girl books is Cecily von Ziegesar.

This unusual Greek flower and color name has gained considerable recent attention via actress Ione Skye, who is the daughter of sixties folksinger Donovan.

Blythe originated as a nickname for an upbeat person, coming from the Old English word bliðe, meaning "merry" or "cheerful." Today the homophone blithe shares the same meaning. Blythe was eventually adapted to a surname before it became a feminine given name.

Oona is a name made famous by Eugene O'Neill's daughter, who became Charlie Chaplin's wife. One of the original Oona's granddaughters was named after her, and is now an actress famous in her own right for playing Talisa of Volantis in HBO's "Game of Thrones." The double-o beginning gives their name a lot of oomph.

Fiadh is the fastest-rising girls' name in Ireland, derived from the ancient root word for "wild". The Anglicized form Fia is one we might see rising in the US as well – to take the place of its popular cousin Mia.

A starry-eyed, intergalactic name, far rarer than Stella or Esther. It's attached both to a comic book character and to Princess Astra on "Doctor Who".

Avalon, an island paradise of Celtic myth and Arthurian legend--it was where King Arthur was taken to recover from his wounds-- and also the colorful capital of the California island of Catalina-- makes a heavenly first name. Actress Rena Sofer and British musician Julian Cope used it for their daughters.

Alba is quietly making a behind-the-scenes comeback, perhaps thanks to actress turned baby-product mogul Jessica Alba. Last on the Top 1000 a century ago, the name was given to nearly 200 baby girls in the US last year. Alba might be tomorrow's successor to Ava and Ella. In Spain, Alba ranks among the Top 20 girls' names. Alba is the name of a character in The Time Traveler's Wife.

Constance is one of the more subtle of the virtue baby names, but still has quite a prim and proper image. One impediment to its revival has been the decidedly dated nickname Connie, though modern parents might well opt for using the strong and dignified name in full.

Fia may be most notable at this moment as the Anglicized version of the Irish Fiadh, one of the fastest-rising names in the Republic of Ireland. The meaning of Fia or Fiadh is sometimes given as "deer" but that's in the sense of a wild deer, as the name relates to the ancient word for wild.

Tamsin is an offbeat name occasionally heard in Britain and just waiting to be discovered here. U.K. actress Tamsin Greig is a star of the show Episodes, Tamsin Olivier is the daughter of Joan Plowright and Sir Laurence Olivier..

Delicate ballerina name with grace, charm, and heft courtesy of Jane Austen's Mr.

Caoimhe, pronounced (more properly) kwee-va or kee-va, is a pretty and distinctive Gaelic name but one that could well lead to no end of confusion outside the Irish community. Even in its native habitat, it is sometimes spelled Keeva.