In the days of huge families, this name of the Roman goddess of prophecy and childbirth, and one of the Fates, would be saved for bambina number ten. Now it might be used for a girl born in October, the tenth month. 
 Some other Latin numerical names you might consider: Octavia, Tertia, Una, Prima.

Decima

Decimus is one of the Roman numeral names used in large Victorian families--in this case for the tenth child. It is now seeing some new life thanks to the cutting-edge fashion for ancient Roman names. 
 The current interest in Decimus has been bolstered by The Hunger Games, in which many of the male characters have ancient Roman names. Decimus was also the middle name of Maximus, Russell Crowe's "Gladiator" character. Other Latin names such as Nero and Tiberius are also hot on Nameberry right now.
 Decimus is a name that was not only given occasionally to nineteenth century babies, but also to several notable literary characters in the works of Wilkie Collins and Anthony Trollope. Decimus Burton was a noted ninetenth century English architect.

Decimus

Duece

Ichiro is a good classic choice for the first boy in a Japanese family. 

Ichiro

The quirky, offbeat and energetic botanical name Ivy is enjoying a deserved revival, propelled even higher by its choice by high-profile parents Beyonce and Jay-Z for daughter Blue Ivy. Ivy is also traditionally used at Christmas, make this one of the perfect <a href="https://nameberry.com/list/577/names-for-december-babies">names for December babies</a>.
 Ivy is derived from the name of the ivy plant, which got its name from the Old English word ifig. Ancient Greeks presented an ivy wreath to newlyweds as a symbol of fidelity. In the language of flowers, Ivy signifies faithfulness.
 British novelist Ivy Compton-Burnett is a notable namesake and Ivy Baker Priest served as U.S. Secretary of Treasury. Another association is the prestigious Ivy League. 
Ivy has been a favorite of scriptwriters—she's appeared on everything from 90210 to Gossip Girl, Dollhouse to Downton Abbey, and is the name of a 1970's American Girl doll.

Nona is a name sometimes given to the ninth child -- but unlikely to serve that purpose today. Musical cred: the name of a song by Motley Crue.
 In Roman mythology, Nona was also a goddess of pregnancy and the spinner of the thread of life.
 Nona was the mother of Saint David, the patron saint of Wales, and said to be a cousin of King Arthur. There is a childrens' book called Strega Nona by Tomie dePaola and an eponymous 1978 Stephen King short story.

Nona

Octavia began as the Latin, then Victorian name for an eighth child. While there aren't many eighth children anymore, this ancient Roman name has real possibilities as a substitute for the overused Olivia; recommended for its combination of classical and musical overtones. It was chosen for his daughter by Kevin Sorbo. 
 Octavia has a rich history and literary pedigree. Commonly used in the Roman Imperial family, one first century BC Octavia was the daughter of Claudius, sister of the Emperor Augustus and the second, pre-Cleopatra, wife of Mark Antony (she appears in Shakespeare's Antony and Cleopatra), while another ancient Octavia was the teenage wife of Nero. The British civic reformer Octavia Hill actually was an eighth daughter.
 The name came into the spotlight recently via Octavia Spencer, who won a Best Supporting Actress Oscar for her strong performance in The Help. And Octavia is part of Cinna's prep team for Katniss Everdeen during the 74th and 75th Hunger Games.
 Octavia is also a First Daughter name as the child of President Zachary Taylor.

Octavia

The most popular of the number names used by Hispanic parents, open to all. Octavia and Octavio are two <a href="https://nameberry.com/baby-names/161/spanish-names">Spanish baby names</a> that are moving out into the wider world.

Octavio

Octavius, which was at one time used for the eighth child in a family, has the worn leather patina of all the ancient Roman names now up for reconsideration. As a Roman family name, it derives from the uncommon forename Octavus, which designated an eighth son.
 The first Roman emperor, Augustus, was called Caius Octavius or Octavian before he took his title. He was the son of Octavius and Atia, the niece of Julius Caesar, who adopted him as his son. He appears under the name Octavius Caesar in Shakespeare's "Julius Caesar" and "Antony and Cleopatra."
 In later lit, Octavius Guy is a character in Wilkie Collins's novel The Moonstone and Octavius Robinson is in George Bernard Shaw's play "Man and Superman," while Octave is the name of the protaganist of a Stendhal novel. And Octavius is the name of an old Roman general in the movie "Night at the Museum."
 Attractive foreign versions include Ottavio and Octavio, as in the distinguished Mexican poet Octavio Paz. Octavio is also the name of several saints, including one who lived as a hermit in an elm tree.

Octavius

Will assure your daughter she's numero uno. 

Prima

Primo is number one among the Latin birth-order names--Octavius et al--and the one most likely to be used in these days of smaller families. It has that jaunty 'o' ending and Italian flavor that many modern parents like so much. And what little boy wouldn't appreciate being prime?
 Italian author Primo Levi, known for his writings on the Holocaust, is a famous bearer.

Primo

The revival of long-dormant Roman names would put this back in the lexicon if it wasn't so connected to a telecommunications network. 

Primus

Quentin, an offbeat name with lots of character, relates to the Latin for the number five and is by far the subtlest and most usable of the Latin birth-order names, masculine as well as stylish and distinctive. It was borne by a third-century saint and came to England with the Normans.
 Sir Walter Scott wrote the novel Quentin Durward in 1823, about a young, upper-class Scotsman, and Quentin Compson is both a male and a female character in William Faulkner's The Sound and the Fury. Real-life bearers include movie director Quentin Tarantino; eccentric British author Quentin Crisp (born Denis); and Quentin Blake, illustrator of Roald Dahl books. Theodore Roosevelt had a son named Quentin.
 Trivia tidbit: St. Quentin is the protector against coughs.

Quentin

Quirky in the way that all Q names are quirky, Quincy was once a buttoned-up, patrician New England name, an image countered in recent years by the talented and ultracool musician Quincy Jones (middle name: Delight; nickname: Q). 
 Quincy's high point of popularity was in 1977, when it reached Number 273, but it still has a lot of energy--and not only for a fifth son. It's one of those golden names that, for boys, ranks steadily in the lower half of the Top 1000, getting neither too popular nor too unusual. The number of girls named Quincy is rising, but there are still two baby boys named Quincy for every girl.
 It is the middle name of John Quincy Adams, the sixth U.S. President, who was named for his mother's maternal grandfather, Colonel John Quincy, after whom Quincy, Massachusetts, is named. Another association is the long-running TV show Quincy M.E.. 
Interesting fact: John Quincy Adams pronounced his name Quin-zee.

Quincy

The feminine Quinta is virtually unused in the US, though male forms of the Roman family name Quintus, such as Quintin and Quentin, are quite popular. That may change with the emergence of comedian and actress Quinta Brunson, creator of the television show Abbott Elementary.

In the Netherlands, the short form Quinty is widely used, and in the US, the related Quincy is becoming popular for girls. Quinn, an unrelated Irish surname-name with a similar feel, is in the girls' Top 100 in the US. Ancient roots coupled with modern rarity make Quinta a highly desirable name.
 
A modern bearer is Quinta Brunson — creator of the sitcom Abbott Elementary.

Quinta

Both this form and Quentin are authentic modern forms of the Roman family name Quintus. Your choice. In the US, this spelling lags behind Quentin and Quinton.

Quintin

Quint or Quinton played to a Latin rhythm.


Quinto

A literary name figuring in the story of Ben Hur and the novels of Anthony Trollope that has the feel of Roman antiquity that is beginning to appeal to many parents. Quintus was one of only about twenty male first names in ancient Rome, and was often (though not exclusively) used for fifth sons.

Quintus

After your first little Primo, you could always call the next Segundo -- though that's like naming them number one and number two. 

Segundo

Septimus is one of the more dashing of the birth-order Latin number names that were revived by the Victorians. So even if you don't anticipate son number 7, you might be bold enough to consider this relic, certainly preferable to sixth-son name Sextus.
 Septimus was popularized by the Roman Emperor Septimus Severus, a patron of arts and letters. There was a Septimus in Wilkie Collins's The Moonstone, in Dickens's The Mystery of Edwin Drood, and in Trollope's Barchester novels. Probably it is most familiar to modern readers as one of the principal characters in Virginia Woolf's Mrs. Dalloway, and as Harry Potter wizard, Septimus Weasley. There is also Septimus Heap, a series of bestselling fantasy novels by Angie Sage.

Septimus

This number name first came to public attention when Erykah Badu and Andre 3000 chose if for their son, Seven Sirius Benjamin, born in 1997. Over a decade later, David and Victoria Beckham used it as their daughter's middle name, and now in these days of unisex word names, it's rising for both sexes. It's certainly one of the most name-like numbers: after all, it's only a letter away from Steven.

Seven

Seinfeld's George threatened to name his future child Seven, and then singer Erykah Badu actually did it. 

Just think about those inescapable "sexy" nicknames. The related Sixtus is not a huge improvement.
Sextus was one of a handful of first names used by the ancient Romans, and was often given to a sixth son.

Sextus

While Sixtine is a name with ancient roots that's popular in modern-day France, it's hard to imagine it gaining hold in English-speaking lands, given its similarity to the number sixteen and its even-more-problematic similarity to the word "sexting."  You wouldn't do that to your daughter.

Sixtine

Segunda

Tertia&mdash;which is occasionally used in the UK, but rarely in the US, would make an unconventional but interesting possibility for the third child in a family. Terza and Terzo are lively Italian female and male variations.
 This is just one of several Roman numeral names that suddenly sound plausible--like Primo and Prima, Decimus, Quintus, etc.

Tertia

Never as well known as that other Roman numeral name, Octavius, Tertius just might hold some appeal for the parent seeking a really obscure name with the patina of antiquity for her third son.

 Tertius was an early Christian and a scribe whp assisted Paul in writing his epistle to the Romans. In George Eliot's Middlemarch, Tertius Lydgate is an idealistic doctor.

Tertius

Originally a nickname for a third-generation son, as in Thurman Thackeray III, Trey is now being given to others, and it has also expanded to Treynor and Treyton. The name also is popular among basketball fans: It's another word for a three-point shot.

Trey

In an epic poem, the personification of truth, beauty, and unity; this ancient name is popular in several European countries but less common in the US. The Oona spelling is slightly more popular but Una sleeker.

Like Verity and Amity, this inclusive virtue name used by the colorful British literary Mitford family is ready to join its more popular peers Hope, Faith, and Grace. 
 The name was embraced by the Puritans in the seventeenth century, but was not as common as others. In literature it occurs as a servant in Thomas Hardy's A Pair of Blue Eyes.
 Unity Valkyrie Mitford supposedly inspired the character of Bellatrix Lestrange in J. K. Rowling's Harry Potter series. Unity Kincaid is a character In the Sandman series by Neil Gaiman.

Unity

Natural's list "Number Names" of 34 great name ideas: Decima - Vii!