Ardenia

Begonia is a pretty flower named for French administrator and amateur horticulturalist Michel Bégon, who was an avid naturalist but also a proponent of slavery. A rare floral choice which has never really caught on as a baby name, Begonia would certainly stand out from the Lilys and Roses. 

Begonia

Delphinia

Davinia

Divinia

Edenia

Elvinia

Erlinia

Evania

More uncommon and powerful than garden varieties like Rose and Lily. Named for Scottish botanist Dr Alexander Garden.

Gardenia

Ilania

Imogenia

Also relating to the sea and the islands, this name is a bit more melodic than its cousins. 

Ionia

Irminia

Lavinia is a charmingly prim and proper Victorian-sounding name which actually dates back to classical mythology, where it was the name of the wife of the Trojan hero Aeneas, who was considered the mother of the Roman people.
 Later literary bearers include the protagonist's daughter in Shakespeare's Titus Andronicus (which has the line "She is Lavinia, therefore must be lov'd"), the heroine of G.B. Shaw's Androcles and the Lion, and characters in David Copperfield, Henry James' Washington Square, and the contemporary The Hunger Games and Downton Abbey--and Lavinia was also used by Thackeray, T. S. Eliot, and by Ursula Le Guin for an eponymous novel.
 Trivia tidbit: Lavinia was Ava Gardner's middle name.
With its vintage nickname Vinnie, Lavinia might well appeal to parents who favor lavender-tinged names like Amelia and Matilda and Maude.

Lavinia

Marsellonia

Marcenia

Marnia

Nathania

Oceania is one of the most elaborate of the trending Ocean-related names. Oceania also refers to the area of the world including Australia and neighboring islands.

Only six baby girls were named Oceania in the US last year, versus over 375 named Ocean. The Oceane version is very popular in France.

Oceania

Olenia

Literary heritage: the "Loony Tunes" girlfriend of Porky Pig.  But with the increasing popularity of all kinds of unusual botanical names, Petunia may be a name we start to hear more of.  Perhaps-more-pleasing Petunia alternatives: Petal, Posy, Poppy.

Petunia

Silvania

Sirenia

Tatiania

Virginia is a lovely place name starting with the fashionable V and having deep historical roots, yet, unlike some other other girls' classics, has been sorely neglected in recent years. 
 The colony/state of Virginia was given its name by Sir Walter Raleigh in honor of Elizabeth I, known as the Virgin Queen, and the first child to be born of English parents in the New World was christened Virginia Dare.
 Virginia was in the Top 10 for 25 years, from 1912 to 1937, hitting a high of Number 6 in 1921, when there were 19,000 newborn Virginias in their cradles.
 She does have a couple of possible downsides—those teasable virgin associations, and the not-quite-ready-for-revival Ginny nickname. But we think they're outweighed by more positive factors, and Virginia is in line for a possible revival.
 Virginia has such distinguished namesakes as writer Virginia Woolf, has been the subject of songs by groups ranging from The Rolling Stones to the Foo Fighters, and has appeared as a character in a number of books, movies, and TV shows—currently co-starring on Masters of Sex. Ginger Rogers was born Virginia.

Virginia

Vidonia

The name of a Christian saint and a city in Ohio, Xenia is one of the more accessible and intriguing x names. It is the name of one of the Bond Girls--played by Famke Janssen in the film "GoldenEye." 
 
Sometimes spelled Ksenia to reflect the traditional Greek pronunciation (kseh-NEE-uh), Xenia is also pronounced ZEEN-ee-ah or SHEN-yah.

Xenia

This <a href="<a href="https://nameberry.com/girls-names">unique girls' name</a> is a Latinx favorite popularized by a character on a Spanish-language soap opera. Jessenia is another variation. The name is drawn from the name of a tree in South America.

Yesenia

Zelenia

Zinnia is an unusual floral choice with a bit more edge and energy than most and beginning to find its way onto namers' wish lists of botanical possibilities. Named after an eighteenth German botanist called Johann Gottfried Zinn, it appears in Roald Dahl's Matilda as the young protagonist's mother.
 In the language of flowers, Zinnias symbolize remembrance.

Zinnia

Anacampseros's list "Girl Names Ending with -Nia" of 31 great name ideas: Ardenia - Zinnia!

Girl Names Ending with -Nia

3 or more syllable names that end with -nia. Mostly long and or unusual names.