…[name]Long[/name] being 3 or more syllables. I really like [name]Everett[/name] nn [name]Rhett[/name]. Any other ideas? I like [name]Montgomery[/name] but can’t think of anything but [name]Monty[/name], which I don’t love.
Find Nameberry’s guide to Long Baby Names here.
[name]Remington[/name] ~ [name]Remy[/name]
[name]Benjamin[/name] ~ [name]Benji[/name]
[name]Alasdair[/name] ~ [name]Dair[/name]
[name]Donovan[/name] ~ [name]Van[/name]
[name]Sullivan[/name] ~ [name]Sully[/name] or [name]Van[/name]
[name]Abraham[/name] ~ [name]Bram[/name]
[name]Bartholomew[/name] ~ Tolly
[name]Callister[/name] ~ [name]Cal[/name]
[name]Lorenzo[/name] ~ [name]Lon[/name], [name]Ren[/name], or Lor
[name]Jeremiah[/name] ~ [name]Jem[/name]
[name]Beauregard[/name] ~ [name]Beau[/name]
[name]Ezekiel[/name] - [name]Zeke[/name]
[name]Obadiah[/name] - [name]Obe[/name]
[name]Harrison[/name] - [name]Harry[/name]
[name]Percival[/name] - [name]Percy[/name]
Malachai ([name]Mal[/name] or [name]Kai[/name])
[name]Finnigan[/name] ([name]Finn[/name])
[name]Thaddaeus[/name] ([name]Thad[/name] or [name]Tad[/name])
[name]Theodore[/name] ([name]Teddy[/name])
[name]Tobias[/name] ([name]Toby[/name])
[name]Maclaren[/name] ([name]Mac[/name])
[name]Zachariah[/name] ([name]Zach[/name])
[name]Jameson[/name] ([name]Jay[/name], [name]James[/name], [name]Jamie[/name])
And I know it was already suggested, but I [name]LOVE[/name] [name]Ezekiel[/name] ([name]Zeke[/name])
[name]Evander[/name] - ‘[name]Van[/name]’ or ‘[name]Ander[/name]’ (or maybe ‘[name]Andy[/name]’)
[name]Leander[/name]/[name]Lysander[/name]- ‘[name]Ander[/name]’ or ‘[name]Sander[/name]’ (for [name]Lysander[/name]) (or maybe ‘[name]Andy[/name]’)
[name]Emmanuel[/name]- ‘[name]Manny[/name]’
[name]Alexander[/name]- ‘[name]Alex[/name]’ or ‘[name]Ander[/name]’ or ‘[name]Xander[/name]’
[name]Augustine[/name]/[name]Augustus[/name]- ‘Auggie’ or ‘[name]Gus[/name]’
[name]Emmerich[/name]/Emeric- ‘[name]Em[/name]’ or ‘[name]Rick[/name]’ or ‘Merick’ or ‘[name]Eric[/name]’
[name]Finnegan[/name]/[name]Finnian[/name]/[name]Phineas[/name]- ‘[name]Finn[/name]’
[name]Aurelio[/name]/[name]Leopold[/name]/[name]Leonidas[/name]- ‘[name]Leo[/name]’
[name]Anatole[/name]- ‘[name]Tully[/name]’
[name]Auberon[/name]/[name]Oberon[/name]- ‘[name]Obi[/name]’ or ‘[name]Ron[/name]/[name]Ronny[/name]’
[name]Osias[/name]/[name]Ozias[/name]- ‘[name]Oz[/name]/[name]Ozzie[/name]’ or ‘[name]Si[/name]’
[name]Theodore[/name]- ‘[name]Theo[/name]’
[name]Thaddeus[/name]- ‘[name]Tad[/name]’
Not sure if this helps but I know a [name]Montgomery[/name] who has the nn [name]Emery[/name].
[name]Jedidiah[/name] - [name]Jed[/name], [name]Jeddy[/name]
[name]Jeremy[/name] - [name]Jer[/name], [name]Jem[/name]
[name]Christopher[/name] - [name]Topher[/name], [name]Chris[/name]
[name]Alexander[/name] - [name]Alex[/name], [name]Xander[/name],[name]Ander[/name], [name]Andy[/name], Xa
[name]Sebastian[/name] - [name]Bastian[/name]
Theodosius - [name]Theo[/name]
[name]Constantine[/name] - [name]Stan[/name], [name]Tino[/name]
[name]Tiberius[/name] - [name]Ty[/name]
[name]Leopold[/name] - [name]Leo[/name]
[name]Emmanuel[/name] - [name]Manny[/name]
[name]Nathaniel[/name] - [name]Nate[/name], Thanio
[name]Solomon[/name] - [name]Sol[/name]
Guilty pleasures:
Cúchulainn (“Kah-HOO-lahn”) - ok I can’t think of a nickname for Cúchulainn, but it’s one badass name. Maybe [name]Colin[/name]?
[name]Geronimo[/name] - [name]Mo[/name], [name]Joe[/name]
Pantaleone - Pants 
or [name]Leo[/name] of course.
Vercingetorix (“ver-sin-[name]JET[/name]-er-ix”) - [name]Jet[/name]
Tutankhamon - Tut. [name]Just[/name] kidding.
[name]William[/name] nn [name]Will[/name] or [name]Liam[/name]
[name]Anthony[/name] nn [name]Tony[/name]
[name]Alexander[/name] nn [name]Alex[/name] or [name]Xander[/name]
[name]Matthew[/name] nn [name]Matt[/name]
[name]Elliot[/name] nn [name]Eli[/name]
[name]Joshua[/name] nn [name]Josh[/name]
[name]Samuel[/name] nn [name]Sam[/name]
[name]Jeremiah[/name] nn [name]Jeremy[/name]
Ok sorry some of these are probably repeats but…
[name]Abraham[/name] nn [name]Bram[/name], [name]Abe[/name], [name]Abram[/name]
[name]Alastair[/name] nn [name]Ace[/name]
[name]Alexander[/name] nn [name]Alex[/name], [name]Lex[/name], [name]Alexei[/name], [name]Sasha[/name], [name]Ace[/name]
[name]Amadeus[/name] nn [name]Maddie[/name], [name]Day[/name], Ames
[name]Augustus[/name] nn Auggie, [name]Gus[/name]
[name]Barnaby[/name] nn [name]Abe[/name] (or [name]Barney[/name] if your not in the US)
[name]Beauregard[/name] nn [name]Beau[/name]
[name]Benjamin[/name] nn [name]Ben[/name], [name]Benjie[/name], [name]Jem[/name], [name]Jamie[/name]
[name]Cordovan[/name] nn [name]Cord[/name], [name]Dan[/name], [name]Van[/name]
[name]Christopher[/name] nn [name]Chris[/name], [name]Topher[/name], [name]Kit[/name]
[name]Dominic[/name] nn [name]Dom[/name], [name]Nic[/name]
[name]Donahue[/name] nn [name]Don[/name], [name]Donny[/name], Hue
[name]Donovan[/name] nn [name]Don[/name], [name]Donny[/name], [name]Van[/name]
[name]Fredrick[/name] nn [name]Freddy[/name], [name]Fritz[/name], [name]Red[/name]
[name]Jonathan[/name] nn [name]Jonty[/name], [name]Jon[/name], [name]Johnny[/name], [name]Nate[/name]
[name]Perseus[/name] nn [name]Percy[/name]
[name]Roderick[/name] nn Rook
Edited for privacy.
I just have one, but as soon as I read your post I thought
[name]Alexander[/name] nn [name]Zen[/name]/[name]Xen[/name] (prn the same).
For [name]Montgomery[/name], how about:
[name]Emery[/name]
[name]One[/name]
Gomry
[name]Omry[/name]
Mon