Do you know anybody named Goliath? How about Judas?
At least there’s Benedict Cumberbatch, but I think we can let that one slide.
Who else can you think of with a given name that goes against the grain?
I work (weekly volunteer) at a center for people who are really down on their luck. The frequency of weird names is considerably higher than in the rest of the world (at least *my *world).
I’m beginning to believe there’s a correlation between bizarre names and life success (inverse correlation, anyway). I can’t prove it though.
I’m going to skip the examples, for privacy’s sake (theirs).
Our family practice is to give common first names with traditional spelling, and rather unusual middle names. The child can then grow up to be just “Robert” or “Katharine”… or use their distinctive middle name in any way they like. My youngest son may well become well known under his first and middle names, for example; his nearest sibling already signs some of her work with just her middle name. (The girls, of course, can dispose of it altogether at marriage if they like.)
One of the older girls never uses her middle name but loves driving people crazy trying to figure out what “X.” might stand for in a girl’s name. (It’s neither Xantippe nor Xaveria…)
In high school there was a guy named Dionysus.
The completely fabricated (as best one can tell) given name is so prevalent these days that it’s outside the scope of what I was after in the OP. It’s more the given name of some infamous or notorious predecessor that I’m curious about.
Things like Herod, Caligula, Lazarus, lots of bad guys in literature or the Bible and whatnot.
Well, there’s nothing infamous about it, but as far as we can tell, Mr. S is one of only two living people in the United States with his first and last name. There’s a third in a cemetery in Texas.
I know several Judases, but of course they all go by Tadeo, Thad or Thaddeus. And what’s wrong with Lazarus? 
Nothing automatically “wrong” with it, I guess. Just unusual in my way of thinking. I’ve never known one to recall it. You?
I knew a woman who named her son Willow, after the movie. De gustibus etc.
Not a person name, but the thread title reminded me that…
We have a road named Off the Beaten Path Rd.
One of my college professors was Augustus, but went by Gus.
Kermit, Garfield, Valentino, Beed, Vollie
A couple, yes. One was going to have another name but was a preemie and gave his parents a couple of bad scares during those first few days. They called him Lazarus because he’d “come back from the dead”.
Compare with the Benjamins I know who got that name instead of the intended one when their mothers died of post-partum fever and, well, it’s a lot more positive! (Benjamin was the youngest of Joseph’s brothers and in Spanish it has come to mean both “youngest child” and “smallest of a series”, such as 2-cup wine bottles or 1-cup coffeemakers)
My best friend’s daughter, who is without doubt the most awesome kid in the world, is named Rowan. My cousin’s daughter is named Harper.
I plan on naming my future cats after bad Roman emperors. My current cat is named Mayhem; she inherited the moniker from a ferret (and then proceeded to live up to it).
Is it Ximena?
Benedict Cumberbatch is British, and so the “Benedict Arnold” thing isn’t really a factor in naming boys over there, I believe.
I used to be a substitute teacher and I remember a little girl who wanted me to help her print her first name. I asked what it was, and helped her write “Donna Lee”. She frowned. “It’s one word.” So I tried again. “Donnalee.” No, she didn’t think that was right, either.
So I did what I should’ve done the first time and checked the roster. The correct spelling was “Donnelly.”
There’s a fair number of Finnish names in my area, from ethnic Finns. Most often, older people, but on occasion you meet a young’un with a Finn name.
Eino, Toivo, Urho, Elma, Ina, Arvo, etc.
I know a girl named Pliny. She is an only child, so she is neither the Elder nor the Younger.
Speaking of Finn names, I know a little boy named Huck.
Did he have a brother (or maybe a sister) named Mickey?