Ethereal combination of Arden and Edith, with a sweet naturey meaning.

Ardith

Arleth has made the US Top 1000 twice — in 2005 and 2021 — thanks to telenovela star Arleth Terán. 

Arleth

A highly unusual Biblical girls' name whose popularity in Latin America is beginning to spill over into the U.S.. Azeneth is one of those <a href="https://nameberry.com/list/317/unique-baby-names">unique baby names</a> we'll be hearing a lot more of.

Azeneth

Ailith

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.
 
Blythe embodies a cheerful, carefree spirit and could be the next Blair/Blaine/Blake/Brett/Britt, with the advantage that it's clearly pink. It joins other other light-hearted names for girls: Felicity, Hilary.
 Blythe is the middle name of Drew Barrymore—in her case a surname from her rich theatrical history.
 The title of the memorable Noel Coward play Blithe Spirit is taken from Shelley's poetic line, "Hail to thee, blithe Spirit"—a nice tribute to a baby Blythe.

Blythe

One of the rarer names to come from the Bible, Cherith has a fresh and modern sound despite its ancient roots. Cherith was the name of the stream that kept Elijah alive during the three years' drought which he announced to King Ahab. 
In English, Cherith pleasingly reminds one of the word cherish which is another plus to this underused girls' name.

Cherith

Cleneth

This appealing Irish name is borne by actor Conleth Hill, who plays Varys in Game of Thrones. It is an anglicization of the original spelling Connlaodh.

Conleth

Corinth

Crysanth

If you like soft, lispy Welsh names like Gwyneth, consider this out-of-the-ordinary one. 

Delyth

Ferelith is an unusual yet deeply-rooted Scottish girl's name, also found in ancient Ireland and drawn from the Gaelic Forbhlaith or Forbflaith.  While it went through a period of dormancy after the Middle Ages, there are some modern women named Ferelith, including actress Ferelith Young and Princess of Denmark Anne Ferelith Fenella Bowes-Lyon.

Ferelith

Because of Gwyneth Paltrow, this has almost become a one-person name, but not in the prohibitive there's-only-one-Oprah sense. Also seen as Gwenyth and Gweneth, this mellifluous appellation is definitely becoming more and more appreciated by American parents-- enough to land it on this year's Top 1000.
 Gwyneth is an Anglicized form of Gwynedd, the name of an ancient Welsh kingdom. Gwyneth Jones is an acclaimed Welsh Wagnerian soprano.

Gwyneth

Hereswith is a rare name that comes to us from the dark ages. She was a Northumbrian saint, whose more famous sister, Hilda, was the Abbess at Whitby and patron of the first English poet, Caedmon. The name has a soft, lispy sound that is more wearable than its spelling would suggest.

Hereswith

Though it may not be as sweet and gentle as, say, Violet, the purple-hued Hyacinth still might hold some appeal for the parent seeking a truly unconventional flower name. 

 In Greek mythology Hyacinthus was a Spartan youth accidentally killed by Apollo, from whose blood sprang a beautiful and fragrant flower, and it is also the name of several saints.

Hyacinth

Janeth

This name of a son of Noah, whose descendants were said to have populated Europe, was well used by the seventeenth century Pilgrims. Pronunciation challenges would seem to hinder its chances for resurgence today, but "Ja" names and obscure Old Testament names are both trendy these days, so you never know.

 Japheth is a major character in the Madeleine L'Engle novel Many Waters.

Japheth

Lilith is derived from the Akkadian word lilitu meaning "of the night." In Jewish folklore she is portrayed as Adam's rejected first wife, who was turned into a night demon for refusing to obey him. Lilith is unrelated to most other Lil- names, with the exception of Lilita, which is the Latvian variation.
 
In spite of its gently pleasant sound, Lilith had for the most part been rarely heard outside of reruns of Cheers and Frasier until its recent rise up the charts. It entered the Top 1000 in 2010 and has risen in recent years.
 Lilith's demonic aura has followed her through popular culture in various fantasy novels including George MacDonald's 1895 Lilith, comics such as Neil Gaiman's Sandman series, TV shows like True Blood, comics, anime, and numerous video games.
 But that could be changing, in part due to Lilith Fair, the all-female traveling music festival organised by Canadian singer Sarah McLaughlin, which has raised millions for women's charities. Lilith may also ride the coat-tails of the resurgence in (non-related) Lily names.

Lilith

Meredith has been considered primarily a girl's name since the fifties, before which it was more commonly used for boys. Comic actor Jay Mohr recently named his son Meredith, which might help it swing back into the blue column. The traditional Welsh pronunciation puts the stress on the middle syllable, making Red a cool nickname possibility.

Meredith

Mareth 

One of the more unusual <a href="https://nameberry.com/list/325/mythological-baby-names-for-girls">mythology names for girls</a>, Neith is the name of the Egyptian goddess of home and femininity.

Neith

Shulamith

Name of the Phoenician deity who was the patron of Carthage, goddess of the moon, and a fertility figure.  Variations include Tanit, Tanis, and Tanitha.  The name is frequently misinterpreted to be an Irish name meaning "estate."  Despite this august heritage, the original form of the name is a bit lispy for use in modern English-speaking lands.

Tanith

True has become an accepted first and middle name; Truth makes an even stronger statement. And with nearly 150 baby boys named Truth in the US in the most recent year counted, as many as were named Ross, the word name is edging up on the Top 1000.

Truth

FractalShadow's list "names ending in th" of 24 great name ideas: Ardith - Truth!

names ending in th

This is a list of names ending in -th: -th is a pretty sound and I love names that contain it at the end.