I worked once with a guy whose given name is Thorro. I’ve wiki’d it, googled it, and asked around about it and not a soul has the slightest idea of the name.
I ask here so that wild guesses would be okay.
Thanks,
mangeorge
Oy. I really, seriously, truly hope that his parents weren’t trying to name him after Thoreau.
Hith parenths had a lithp and had lived a life of thorrow.
Well, obviously, his parents couldn’t decide whether they wanted to name him Thor or Zorro. Most awesome name ever! 
I wonder if his parent are thorry they named him Thorro.
Have you done a completely Thorro Google search for the name? 
Root name: Thor. Thorro: variant of Thor.
A Lucy is still a Lucille. A Mandy, Amanda. Topher? Christopher. Ving? Irving. And so it goes.
That was my first thought, and I asked him about it. He said “no”, and didn’t elaborate. I left it at that.
That would be kinda cool, but unlikely. Fod one thing he had a christian upbringing.
Forgot, but wanted to mention I know a pierced, tattooed, crystal-wearing, dance-around-the-oak-trees, New Age single dad who named his little redhaired son “Thorin” (from The Hobbit). Some people were aghast, but why NOT? Last I heard, he was happy and leading a normal life.
[nitpick]
“Whence” means “from where.”
[/nitpick]
You’re gonna have to find yourself another nit.
From m-w;
I was trying to be poetic, dang it!
My husband works with a Thor. What’s best is that he’s got a stereotypically Hispanic last name (like Gonzales, but that’s not it). In Minneapolis. And he’s a blond nordic type.
It just tickles me to no end. Rather like the restaurant chain Carlos O’Kellys. Meet Thor Gonzales, the well known Norwegian Colombian!
As mangeorge notes, this is a nit not worth the picking. While “whence” by itself means “from where”, the phrase “from whence” is not only not solecistic, but probably as well attested as the “from”-less usage. Je ne sais pas why English-language mavens have such an issue with acceptable redundancies.
I googled for “Saint Thorro”, because sometimes parents have to really stretch to find a good name for the saint’s day their child was born. No hits, but there’s at least three other people named “Thorro” and a vacation cottage. Maybe his parents went on holiday there and named him for where he’d been conceived?
Must be fans of the “gay blade”. So much so, they gayed up the name (by giving it a lisp). 
(Hey, I have a lisp, I can (and do) make said jokes.)
So? My name is David (Hebrew name) and I have a Christian upbringing. Christian names come in all types and sizes. Thor would be a useful name I would think regardless of upbringing - not too many people worship the old Norse gods anymore …
That’s a stretch, don’t you think? Christians and Jews worship the same god (I’m neither). Paganism is a way different story. Isn’t it? I don’t recall for sure Christians’ attitude toward false gods.
BTW; is that apostrophe right?
Is it his actual given name, or is it a nickname? And are you certain about the spelling?
Could be Nordic, some variant of Thor, Thorvald, Thorfin, etc.
Could be Hispanic, a variant of Toro, meaning “bull”
You said you were open to wild guesses, so here are a few. I’m going for an obscure variation of Arthur/Arturo, Theodore, Thorsen, or Thurston. George Thorogood has had a long career, so it’s possible Thorro’s parents were fans.