Abramius

Adeodatus

Agapetus

Agapito

Agatho

Agáthon

Anacletus

Anastasius

Anicetus

Anterus

Anthērós

Aníkētos

Aristus

Athalaric

Avienus

This Italian form of Benedict sidesteps the Benedict Arnold association that still clouds the English version. 

Benedetto

A name borne by nine popes and several saints, which carries strong Catholic connotations. British politician Jacob Rees-Mogg named his sixth child Sixtus Dominic Boniface Christopher in 2017.

Boniface

Berengar

Caius is classical and serious but also has a simple, joyful quality. There was a third century pope named Caius, as well as an early Christian writer, several Shakespearean characters, and a Twilight vampire. We would pronounce the name to rhyme with eye-us though at Cambridge University in England, where it's the name of a college, it's pronounced keys. 
 Nickname Cai is a definite asset.

Caius

Clement, the name of fourteen popes and several saints, has a pleasantly, positive, slightly antiquated feel, like the phrase "clement weather." 
 Clement C. Moore wrote the poem "A Visit from St. Nicholas," Clement Attlee was a prominent post-World War II British Prime Minister, and Clement Greenberg was the art critic who promoted Abstract Expressionism.
 The hero of Thomas Hardy's The Return of the Native is Clement Yeobright, known as Clym rather than the usual Clem.

Clement

Sometimes used as a short-form of Catholic Pope name Anacletus, Cletus is an ancient name that has not-yet found the popularity of Theodore, Leo, Atticus and Max. It perhaps suffers from its association to the yokel character in The Simpsons , but we think it's time for a reconsideration, given how well it fits into several current trends. Nickname Clete is cute as a button!

Cletus

This Roman Emperor's name has long been considered too grand for an American boy. But in this era of children named Augustine and Atticus, it just may be prime for an unlikely comeback. 
 Constantine the Great was the first Roman Emperor to convert to Christianity and issued the Edict of Milan, which proclaimed religious tolerance throughout the empire. Constantine was also the name of three medieval Scottish kings.
 A modern bearer is Constantine Maroulis, singer and actor and American Idol finalist. The 2005 horror film Constantine featured a hero by that surname.
 Advice: Find a nickname other than Connie.

Constantine

Caelius

Callixtus

Castinus

Castorius

Celestine

Charlemagne

Conon

Cornelius.

Costantinus

Damasus

Dionysius derives from Dionysus, the Greek god of wine, revelry and fertility. This Romanized spelling has been used for poets, soldiers, and saints throughout the centuries, but is hardly ever seen today.

Dionysius

Deodatus

Deusdedit

Dioscore

Dioscorus

Dióskouros

Domnus

Donus

The yoo sound at the beginning of a name has not typically been attractive to the modern ear. Probably the most appealing form of this ancient name has been the feminized Eugenie, thanks to the British princess.

Eugenius

Eleutherius

Eleutherus

Eulalius

Eusebius

Eutychian

Eutychianus

Evaristus

Fabian is the ancient name of a saint and pope that also has Shakespearean cred as Olivia's servant in Twelfth Night and more recently made an appearance in Harry Potter. In the U.S. Fabian became best known via the 1960s teen idol/singer who went solely by his first name.
 The name was brought to England by the French around the sixteenth century. Except for a few scattered earlier appearances, Fabian has been solidly on the U.S. pop list since 1959. It is a particularly <a href="https://nameberry.com/popular-names">popular name</a> in the Latino community and even more well used in several other countries, including Austria, Chile, and Poland. Fabiano is an attractive <a href="https://nameberry.com/baby-names/506/italian-names-for-boys">Italian name for boys</a>.

Fabian

Fabianus

Felix is one of those ancient but nontraditional names for boys that have come into favor over the past few decades, a favorite of parents who want a masculine name with history and heft that breaks ranks with the standard Franks and Freds. Felix is also an international darling, ranking in the Top 100 in several European and English-speaking countries.

Felix was originally a Roman surname but was adopted as a nickname by the ancient Roman Sulla, who believed that he was especially blessed with luck by the gods. It is the name of four popes and sixty-seven saints; in the Bible, Felix is a Roman procurator of Judea.
 
Felix, energetic and upbeat with a felicitous meaning, has finally transcended its negative associations to Felix The Cat and the persnickety Felix Unger. 
 
The name appears in literature as the central character in George Eliot's novel Felix Holt, the protagonist of Thomas Mann's Confessions of Felix Krull, in Thomas Hardy's Tess of the D'Urbervilles, Henry James's The Europeans, Kurt Vonnegut's Cat's Cradle, and as a member of the Volturi Guard in the Twilight series. In movies Felix has popped up in everything from several James Bond films to Spy Kids and The Hangover.
 
Gillian Anderson and Elizabeth Banks are two modern celebrities who chose Felix for their baby boys. A notable namesake is Felix Frankfurter, a long-term Supreme Court Justice.
 
Popular in the Hispanic community, Felix is also celebrating a surge abroad. Felix has been on the <a href="https://nameberry.com/popular-names">U.S. popularity list</a> for as long as records have been kept and is rapidly becoming a Nameberry fave.

Felix

A Latin clan name that may rise again along with other things Roman. 

Flavian

Flodoard

Formoso

Formosus

Fortunatus

Stately Gaius (pronounced GUY-us) was in the name of many ancient Romans, including Julius Caesar. Little-used before the year 2000, it now feels like a fresh possibility in the revival of Latin boys' names like Atticus and Cassius. Caius and derivatives like Caio come from the same root, and in ancient Roman times Caius was probably pronounced as Gaius. You could also see Gaius as a male version of the earth-goddess name Gaia.

Gaius

Giovanni is a venerable Italian classic that suddenly sounds fresh and cool. Ubiquitous in Italy, it has countless notable namesakes, from writer Boccaccio to designer Versace (nn Gianni).

Giovanni

Gelasius

Gordianus

The only version that works for boys anymore is the Latinate Hilario or Ilario. Better to look to Felix for a happy-meaning name. 

Hilary

This early name of emperors and popes survives in modern forms such as Honor, used for both genders.

Honorius

Hilarius

Hippolytus

Honesta

Hormisdas

Hyginus

Innocent, the name of thirteen popes, is rarely heard in a secular setting, where its loaded meaning could open the door to ridicule. 

Innocent

Ioannes

Jocundus

Kónon

Lively nickname, but we'd prefer the more substantial Orlando. 

Lando

An Italian spin on the current European darling Leon, though the final e makes it a tad feminine to the American sensibility.

Leone

Can Linus lose its metaphorical security blanket and move from the Peanuts page onto the birth certificate? We think it has enough charm and other positive elements going for it for the answer to be yes.
 In Greek myth, Linus is both a musician and poet, the inventor of rhythm and melody who taught music to Hercules. In the Christian era, Linus was the name of the second pope, Saint Peter's successor, while in modern times chemist Linus Pauling was awarded the Nobel Prize twice.
 Humphrey Bogart as Linus Larrabee won the heart of Audrey Hepburn in Sabrina, and Matt Damon played Linus Caldwell in three of the Oceans movies. 
 Linus is currently in or around the Top 50 in Germany, Sweden and Norway, and is one of the most popular boys' names on Nameberry.

Linus

Lucius is an old Roman clan name that has lots of religious and literary resonance, yet is still vital today. It was the name of three popes, appears in several Shakespeare plays, and, like all the names beginning with 'luc' relates to the Latin word for light.It was one of a limited number of forenames used in ancient Rome, and because of its meaning was often given to boys born at dawn.
 In the Bible, Lucius is the name of three people; Shakespeare used it for the son of Titus in Titus Andronicus, a young servant of Brutus in Julius Caesar, a lord in Timon of Athens and a Roman general in Cymbeline.
 Other fictional bearers of the name can be found in Le Morte d'Arthur, The Golden Ass, Ralph Ellison's Invisible Man, Faulkner's The Reivers, Batman, Talladega Nights, and The Incredibles. Lucius Malfoy, the father of Draco, is a Harry Potter villain, and other Luciuses have been portrayed on screen by Morgan Freeman, Joaquin Phoenix and Luke Wilson.
 Real-life namesakes include renowned World War II General Lucius B. Clay, and writer, photographer, and bon vivant Lucius Beebe.

Lucius

Liberius

Lioutio

Lioutsios

Liuprand

Liutprand

Liuzo

Lothair

This ancient Roman family name, first borne by the distinguished Marcus Claudius Marcellus and later by two popes, is a possibilty in the hot new category of names from antiquity.

Marcellus

Mammalus

Marcellinus

Mariozza

Mariuccia

Marozia

Melchiades

Militades

Natalius

Nikephoros

Novatian

Novatianus

Novatus

Ottaviano

Pascale

Paschal

Paschalis

Pasquale

Sesquipadelian's list "Popes and Antipopes" of 145 great name ideas: Abramius - Zosimus!

Popes and Antipopes

Just interesting names Popes have had (whether given or chosen), as well as names related to the Popes. Not gonna include the obvious like Peter or John or John-Paul. While many early popes kept their given name, it was often latinized (similarly to how we call Christopher Columbus Christopher even though his first name was likely Cristoffa).