Freya has long been popular in the U.K. but has only taken off in the US in the last decade, along with the entire category of mythological names. Derived from the Old Norse name Freyja, meaning "Lady, noble woman", Freya is the name of the Norse goddess of love, beauty, and fertility.

Sleek, sharp, and soulful, Isolde is the German form of Iseult, the fabled lover of Tristan in the Arthurian romances. First appearing in the 12th-century, the name was fairly popular in the form of Iseult, Yseut, Yseult, and Ysolt, however, it wasn't until the 19th-century that this form began to catch on, after the composer Richard Wagner used it for his 1865 opera (and for his own daughter!)

One of the few remaining unrestored vintage gems, with a choice of two winning nicknames--the girlish Winnie and the tomboyish Freddie. Winifred, the name of a legendary Welsh saint, was a Top 200 name into the mid-1920's.

Sunniva was an Irish-born saint who fled to Norway, where she hid in an island cave with her followers and eventually died. After miracles were reported on the island, the cave was excavated and Sunniva's intact body was found. Sunniva is the patron saint of Western Norway. Her name would make a fascinating and unusual choice for a modern baby girl, and if her story is a bit grim, you can take refuge in the upbeat nickname Sunny or Sunni.

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

An unusual Gwyn name with a lovely meaning, this compound name pairs Gwyn with the name Eira, meaning "snow". A relatively modern creation, it remains very rare.

A mythological Welsh name with an intriguing sound, Ceridwen appears in several Welsh legends, in which she is an an enchantress and the owner of the cauldron of poetic inspiration. She is also associated with the great bard, Taliesin, with one 16th-century tale recounting that when her servant consumed a potion of wisdom, intended for Ceridwen's son, Ceridwen swallows the servant, who is then reborn through her as the bard.

This lovely name from Spenser's The Faerie Queene is borne by a character who represents married love. A related unusual-yet-usable choice: Amabel.