With its musical allusions, a harmonious possibility. 

Alto

Ammon is connected to two religions in the US and is used exclusively between the two of them. Prior to the 1960s, Ammon was considered a solely Amish name. In the Amish community, Ammon is bestowed in honor of Jacob Amman, whom the Amish sect is named after.
 
These days. Ammon is also a Mormon name. There are two figures called Ammon in The Book of Mormom, and Utah now has the largest number of babies named Ammon each year.

Ammon

A lot of parents claim to want a name that's different, but if you really do, Aquilina, modern-feeling but based on an ancient favorite, would be one good choice.

Aquilina

More appealing than the English version, Aubin might be seen as a fresher and more decidedly masculine twist on Aubrey.  This handsome discovery is now ranked at Number 311 in its native France.

Aubin

Aizan

Aleydis

Alodia

Amator

Amor

Anysia

Arator

Asella

Atto

Attracta

Auspicius

Authaire

Autonomous

Autor

Auxibius

Aventine

This more user-friendly Anglicized form of Beacan, could profit from its kinship with the popular Beckett--with which it could share the nickname Beck. Becan is an Irish saint's name, attached to the founder of a sixth century monastery.
 For ease of pronunciation, it can also be spelled Beccan.

Becan

Benno is a cool name in its own right -- there was a tenth century Saint Benno -- though it is also used as a lively nickname for Benjamin. Saint Benno of Meissen is the patron saint of anglers and weavers and, strangely enough, alliteration.
 Benno came to attention in the U.S. via the father and son duo of Benno Schmidt Sr. and Jr. Senior was the venture capitalist who invented the term venture capitalist and Junior was the president of Yale University. Benno is also the appellation of a student character in Umberto Eco's The Name of the Rose.

Benno

Bobo was the name of one of the most famous clowns in American circus history, who performed from the 1920s until the 1970s. But that's not the only reason this makes a less-than-optimal nickname.

Bobo

Brogan is a cheerful Irish surname that would fit right in with the Logans and Br-starting names now trendy for boys. It's been on the pop list for the past three years, though it's sliding again. Its history includes Saint Brogan (Broccan in Gaelic), who was Saint Patrick's nephew and scribe.
 In "Shrek Forever After" Brogan was an ogre voiced by Jon Hamm. Supposedly, the character was almost called Gnimrahc--or Charming spelled backwards. Brogan is better.

Brogan

Basura

Bavo

Bean

Bobinus

Breaca

Bretannion

Buriana

Byblig

A royal name in ancient Egypt that's never quite made it to the modern world, though nickname Cleo is widely used.  Other now-extinct Cleopatra diminutives, including Cleora and Cleola, achieved some popularity in the early 20th century when there was a crazy for all things Egypt-related as the ancient tombs were opened and artifacts displayed.  In the US, Cleopatra became a popular silent film in 1917 starring Theda Bara.

Cleopatra

Like Sky and Sunshine, this fluffy name from the hippie 1970s has floated back onto the naming radar. 

Cloud

Too many Connors in your neighborhood?  This name--spelled with one 'l' or two--is equally authentic and much more unusual.

Conall

Cronan

With a long and noble history -- Cyprian was one of the great Christian Latin writers -- this could make a highly unusual but meaningful choice. 
 Cyprian has been in use since medieval times, initially made known via the third century lawyer, martyr and bishop of Carthage, St. Cyprian, who wrote widely on theological themes...
There was a noted Nigerian writer named Cyprian Ekwensi, and a character named Cyprian in a Louise Erdrich novel, and in Harry Potter, Cyprian Youdle is a Quidditch referee.

Cyprian

Caian

Caimin

Colgan

Conogon

daisy451's list "Best Little-Known Saints: A-C" of 42 great name ideas: Alto - Conogon!

Best Little-Known Saints: A-C

The most interesting, unusual, or usable saint's names.