Abbott is a neglected masculine surname with religious overtones as the head of a monastery. Though the feminine nickname Abby could be a slight drawback, Abbott is still an attractive offbeat possibility. 
 The political activist and co-founder of the Yippies, Abbie Hoffman's birth name was Abbott.
 Abbot (one 't') Kinney is known for developing Venice, California--whose main throughfare bears his name.

Abbott

Adlai is an Old Testament name long associated with 1950's liberal presidential candidate Stevenson, who was named after his grandfather, who was Grover Cleveland's vice president in the nineteenth century. Now it's an unusual Biblical choice ripe for rediscovery.
 In the Bible, Adlai was a minor character, the father of one of King David's herdsmen. Adlai is a contracted form of the Hebrew name Adaliah.

Adlai

Adley is one of those rare <a href="https://nameberry.com/unisex-names">unisex names</a> that probably developed via different paths on the girls' and boys' sides, with the male Adley a phonetic spelling of the Hebrew Adlai, while the girls' version, which briefly made the Top 1000 in 2012, is an abbreviation of the trendy Hadley, an English place name and surname.

Adley

Often found as a brand name in the hi-tech and industrial worlds. 

Aegis

Almer

The eleventh brightest star in the sky has a celestial feel, but also could be the name of a commercial airline. 

Altair

Amory is the kind of executive-sounding surname name that became popular in the 1990s. Amory Blaine is the protagonist of the F. Scott Fitzgerald novel, This Side of Paradise.

Amory

Anduin is the Sindarin name for the Great River of Wilderland in Tolkien’s fictional Middle-earth. The word means "long river" or "great river".
 Anduin is also a character name in the popular World of Warcraft video game franchise.

Anduin

Arbor is a quirky nature name with holiday vibes.

Arbor

A patriotic place name, with its connections to Arlington National Cemetary.

Arlington

Best remembered as one of the boys in "Old Yeller" and the title of a late 1990s HBO sitcom, "Arliss," featuring sports agent Arliss Michaels. Also sometimes heard as a girl's name and a surname (as in early film star George Arliss).

Arliss

Audley

Audon

Aaorn

Aaven

Abacuc

Abeldain

Aceland

Acorion

Acoya

Adael

Adderly

Addington

Adelon

Aderian

Aderris

Adner

Adragus

Adric

Adris

Aedric

Aeon

Agnew

Aimeric

Ainsworth

Akadian

Alair

Alandan

Alandis

Albritton

Alclaine

Alldrey

Allston

Amberson

Amburgey

Amsden

Anden

Andric

Andry

Andwell

Anias

Appomattox

Arrington

Artigues

Avedis

Baden

Bale

Dalton with a B. The original is better. 

Balton

Rarely heard last-name-first choice with nice gardenlike feel. 

Barden

Bayden

Beecher

Belden is a little-used surname-name that might work in this age of Belles.

Belden

Conjures up the military image of Fort Benning in Georgia--or the surname of actress Annette.. 

Benning

Beric

Two completely different images come from its national pronunciations -- BOY-err or boy-AY -- the latter giving it an effete French accent. 

Boyer

Branigan, also spelled Branagan or Brannigan, is an Irish name full of energy and cheer. It was the title of a 1975 John Wayne movie, and Zapp Brannigan is the antihero of the animated sitcom "Futurama." 

Branigan fans might also want to consider such related <a href="https://nameberry.com/baby-names/168/irish-names">Irish names</a> as Brennan and Breccan, Rafferty and Finnegan.

Branigan

The suffix Bran is familiar as raven-related since Game of Thrones, and the -ley suffix has been popular since the 1990s heyday of Ashley.

Branley

Bray

An Irish surname choice that could very well make its way into first name territory.

Breslin

St Briac was an Irish saint who arrived in Northern France in the 6th century and gave his name to the small commune of Saint-Briac-sur-Mer in Brittany. The name is thought to be related to Brian, though it may be a completely separate name stemming from the Celtic word "bruaich" meaning "steep hill". Briac definitely brings a fresh continental feel and would be a good choice for those who would like a name with both French and Irish connections

Briac

A lesser-used presidential choice, with a charming, buccaneering sound. Fictional bearers include the Marvel Comics character James Buchanan "Bucky" Barnes, as well as the heroine of F. Scott Fitzgerald's The Great Gatsby Daisy Buchanan.

Buchanan

The Dutch meaning (Buell is the Dutch occupational name for a hangman) is enough to keep most people away. 

Buell

Related to the word bourgeois; actor Burgess Meredith put this surname in first place. 

Burgess

Balen

Bane

Beckley

Bellen

Bennington

Berlange

Bilson

Blace

Bracken

Braddock

Brannock

Braven

Braverick

Brawton

Breadon

Breland

Brendston

Briden

Brinkley

Brodan

Browning

Bryland

Brylar

You don't need to choose the longer form of this unusual name to arrive at Cabe, brother of Gabe and Abe.  This earthy, unusual, friendly nickname-name was given to a handful of boys last year and can make an intriguing choice.  But be warned: It will forever be mistaken, at least at first hearing, for the more familiar Gabe.

Cabe

Caddell

Cagney is one of the spunkiest Irish surnames around, and could make a lively and fresher successor to the tired Casey.
 James Cagney will be remembered not only for his iconic gangster films, but also for his Academy-Award-winning performance as song-and-dance man George M. Cohan in Yankee Doodle Dandy. Cagney & Lacey was a popular 1980's policewomen drama.

Cagney

More common as a surname, a handful of boys get this bovine equivalent of Shepherd each year in the US. It may gain more exposure as one of the occupational names that are one of the most popular classes of <a href="https://nameberry.com/baby-names/502/english-names-for-boys">English names for boys</a>.

Calvert

LaurenVD's list "Extra Unusual Boys Names" of 137 great name ideas: Abbott - Creston!

Extra Unusual Boys Names

A list of unusual boy names I found throughout the web and various name books.