A biblical character who was one of David's most valiant warriors and was known for being fast.  But in the modern English-speaking world, this name may be too close to an insulting anatomical word.

Asahel

Almadion

Alney

Anenwin

Angisel

Antenor

Asenath

Ashbel

Benajah, the name of several minor Old Testament figures, is also written as Benaiah.  Benajah might make a great Benjamin update or name for the son of a builder or architect.

Benajah

Blaney

Bodilon

Bygod

Churchwell

Dusty

Dagobert

A bit too elephantine for a modern child.

Eliphalet

Elphlet

Ethelred

Ezbon

Ferither

Frosti

Grain

Halfdan

Herbastus

Ivo is an unusual, catchy name with the energetic impact of all names ending in 'o'. Hardly heard in the U.S., it is used a bit more frequently in England, as is the related Ivor, a favorite of such novelists as Evelyn Waugh and P.G. Wodehouse. Ivo is currently most popular in the Netherlands.

A fresh Dutch take on George, although you’re likely to get pronunciation errors upon first meetings.

Joris

Jobana

Keder

Kive

Milo is most commonly considered to be Germanic name derived from the Latin word miles, meaning "soldier." However, there is evidence to suggest it also may have independently spawned from the Slavic root milu, meaning "merciful." Milo predates brother name Miles, a variation that evolved when the name immigrated to the British Isles in the Middle Ages. Mylo is an alternate spelling.
 
Milo has long been a favorite <a href="https://nameberry.com/boys-names">boys' name</a> on Nameberry, also getting some well-deserved appreciation in the wider world. Milo combines the strength of the ancient Greek Olympic wrestler of that name—a six-time winner of the Olympic games—with the debonair charm of a WWII RAF pilot.
 More recently, Milo has been associated with the dashing Milo Ventimiglia of This Is Us fame, and it has also been the name of characters in books Catch-22 and The Phantom Tollbooth, and on screen in Milo and Otis, Alias, and Atlantis: The Lost Empire.
 Ricki Lake, Camryn Manheim, Sherry Stringfield, Liv Tyler, Craig Ferguson, and Alyssa Milano are six celebrity parents who share our enthusiasm for Milo, as do many Nameberry baby namers.
 Milo is often heard in Ireland. Milo O'Shea was a renowned Irish character actor.

Milo

Maromir

Medad

Ancient Irish saint's name that's unlikely, because of its similarity to "ninny," to join cousin Finian in popularity. 

Ninian

If you think there are too many Zachs around, you can use this historic nickname for Zachariah instead, though it does have a somewhat feminine feel.

Riah

Ruhana

Sherod

Snaer

Stofel

Verne

Verenus

If you're looking for a name that's light and breezy, this could be it. A name from mythology: Zephyrus/Zephyr was the Greek god of the west wind-- with many European variations, it's a name that's frequently seen in computer and video games, is a character in the children's book Silverwing, and appears in the Babar books--as a monkey.
 Robby Benson and Karla De Vito named their son Zephyr in 1992, and Zephyr Benson is now an actor himself. More recently it was chosen by tech entrepreneur Sean Parker for his baby boy.

Zephyr

Though a common name in Hungary, the relatively rare Z sound is striking to English speakers. Penn Gillette used the Zolten spelling for his son; it was also the name of Dracula's dog, and was also a robotic character in Dude, Where's My Car?.

Zoltan

queenalynna's list "Family Tree Names - Male" of 43 great name ideas: Asahel - Zoltan!

Family Tree Names - Male

My Dear Mum is a genealogy pro. Here are some interesting names from our past.