This softer version of Adolf is sadly still off-limits due to the connotations with Hitler.

Adolphus

A famous seventh-century saint and church historian whose name has not survived as well as his works. Known as the Venerable Bede, this Benedictine monk is considered the first known writer of English prose, and highly influential via his The History of the English Church and People.

Bede

Hip short form of Bernard, also Swiss place-name. 

Bern

Blake -- an early unisex option -- dropped out of the Top 100 in 2017 for the first time since 1988, but remains a sophisticated choice. And yes, both conflicting meanings of Blake are accurate. It originated as a surname in England derived from a nickname. Much of its masculine image was influenced by the wealthy, silver-haired character Blake Carrington in the massively popular 80s TV series Dynasty. Rosie O'Donnell has a son named Blake.

Blake

Cashel is one of the many appealing <a href="https://nameberry.com/baby-names/168/irish-names">Irish names</a> that have not yet emigrated to the US. Cashel was chosen by actor Daniel Day-Lewis and his writer-director wife Rebecca Miller for their son. 
 In Ireland, Cashel refers to a circular stone fort. It is the name of a town in Tipperary and the protagonist of the George Bernard Shaw novel Cashel Byron's Profession.
 The Cash sound feels especially contemporary and appealing now, with Cashel joining such stylish brothers as Cassius, Cassian, and Cash.

Cashel

Colton is a trendy two-syllable choice, with the popular 'on/en' ending.
 Colton jumped onto the popularity list in 1982 at Number 806. Then, in 1988, the hunky character Colton Shore was introduced on the soap opera General Hospital, and the name began to zoom up the list. Coincidence or contributing factor?
 Another attractive namesake is Teen Wolf heartthrob Colton Haynes. Short form Colt has been used by a couple of celebs.

Colton

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

Conall

This name shares sounds with Keagan and Teagan, but has its own roots in Irish culture. Freestyle Motocross rider Brian Deegan may be partly responsible for this name's entrance into the US Top 1000.

Deegan

This genial Irish surname feels much more current than Donald. 

Donahue

Douglas, and more particularly its nickname, Doug, had a real romantic swagger in the 1950s and 1960s dating back to swashbuckling Douglas Fairbanks, but today is more likely to conjure up your mom's prom date. Originally a Celtic river name, it became attached to a powerful Scottish clan, renowned for their strength and courage. In its earliest incarnation, Douglas was used equally for girls and boys.
 Douglas has been on the popularity list for as long as US records have been kept, for a considerable period in the Top 100, often used to honor World War II General Douglas MacArthur.

Douglas

A two-syllable surname feel puts this name of an important English saint in the running -- though it could sound like a confused cross between Duncan and Dustin. 

Dunstan

Kennelly could be an upbeat modern namesake for a Grandpa Kenneth; it can also be spelled Kenneally.

Kennelly

Leander is an almost unknown name with great potential as a possible alternative to the overused Alexander. In Greek legend, Leander was the powerful figure who swam across the Hellespont every night to visit his beloved Hero, a priestess of Venus.
 Leander is currently a Top 40 name in Norway; Leandro is the attractive Spanish form, and Leandre is popular in France--it appears in three Moliere plays.
 Leander Sydnor was the name of one of the younger police detectives on The Wire.

Leander

Lennox is an aristocratic and powerful Scottish surname name made truly special by that final x. The worldwide fame of British boxer--World and Olympic champion--Lennox Claudius Lewis brought the name into the spotlight as a first name, while as a last it's tied to Eurythmics singer Annie L.
 The Thane of Lennox appears in Macbeth, Mary Lennox is in The Secret Garden and there are two Agatha Christie characters with the name.
 Lenox is another accepted spelling.

Lennox

Lowell is an upstanding and somewhat conservative name that calls to mind the genteel patrician families of nineteenth century New England, such as the one poet Robert Lowell was born into. Two other Lowell-surnamed poets are Amy and James Russell.
 Lowell was at its height in the 1930s, when it reached Number 148, and has been off the list since 1986--long enough to deserve a reappraisal.
 Namesakes include Governor Lowell P. Weicker of Connecticut and noted newsman Lowell Thomas; on TV Lowells have been featured on Wings and Sons of Anarchy.
 An interesting British upper-class spelling is Loel.

Lowell

Lynden

Used almost exclusively in England; would make an equally amiable short form here for Raphael or Rafferty -- and could also stand on its own. If you're looking for <a href="https://nameberry.com/search/boys-names/r">boys' names starting with R</a>, this is one of your cooler choices.

Rafe

Randall

A German surname name deriving from the same root as English Ryder. Traditionally, it was the name of the second lowest hereditary rank of the nobility, roughly equivalent to English Baronet. Notable associations are British actor Paul Ritter and a popular European chocolate brand.

Ritter

This spirited Gaelic classic, which became popular in Ireland via the illustrious twelfth century king Rory O'Connor, makes a highly energetic choice, now used for either sex. Rory's gender split is still trending boyward; it's one of the coolest <a href="https://nameberry.com/search/boys-names/r">boys' names starting with R</a>. 
 In England and Wales, however, the name is virtually never given to girls. It's seen as thoroughly male (and non-female) as Roger or Richard.
 Rory first came to attention in the US in the person of mid-century pin-up boy Rory Calhoun (born Francis Timothy). The name entered the popularity list in 1947, peaking at Number 280 in 1959. 
 Young Irish U.S. Open champ Rory Mcllroy makes a worthy namesake. Bill and Melinda Gates chose Rory as the name of their only son.
 Rory is a popular choice all throughout the UK. Skip baffling Gaelic spellings like Ruari and Ruaidhri and stick with the more straightforward Rory.

Rory

Rudy has a bit of style currency, thanks to the fact that Jude Law used it for his son. It has been consistently in the Top 1000 for as long as Social Security records have been tallied, as opposed to parent name Rudolph, which, perhaps due to the reindeer, hasn't been heard from in some time.
 Some people still remember Rudy as a young girl character on The Cosby Show; it appeared again on The Practice, where Judge Rudy Fox was a female.
 The titular protagonist of the 1993 film Rudy was a male.

Rudy

Seneca's distinguished heritage as the name of the ancient Roman philosopher-playwright who tutored Nero, and of an Iroquois tribe makes this an interesting choice for either sex. 

Seneca

Rarely heard in modern times, it was used by Norman Mailer for the hero of his book The Deer Park.

Sergius

Georgiapumpkin's list "Literary Sounding Boy's Names" of 23 great name ideas: Adolphus - Sergius!