It’s a take on Raijin, god of thunder.
According to my wife Raijin is not really seen as benevloent and is really not the kind of thing you would/should name a kid.
And I see John Mace beat me to it 
I dated an Arwen years ago. I have since been surprised to find out how many of them there actually are out there.
I don’t get it. If he’s so embarrassed by his middle name, why doesn’t he leave the initial off his nametag? 
(Bolding mine) I’m surprised he would put his middle initial on his name tag.
ETA: Great minds, Manduck.
There is an older man at my local tire centre named “Gawain”. I had “The Mists of Avalon” in my hand while talking to him, looked at his nametag, then did a doubletake. I refrained from commenting.
I know of an Arwen who’s three years old (friend of a friend’s daughter.)
My job also exposes me to a lot of names and I recently came across a “Strider” and a “Taz” as given names.
I knew a guy named Lorien, born in 1967. Mom = hippy, not surprisingly.
Continuing in the Trek universe, friends of our named their daughter Jadzia. It is a pretty name. They were considering Dax for a boy. “That’s a strong name,” said the dad.
There was a guy in my high school class whose middle name is Mithrandir. I was a little bit jealous.
I had a professor who named her daughter Arwen. I’m not surprised there’s a lot of them out there, it’s a pretty name that doesn’t sound too far out there.
I agree. “Arwen” sounds almost normal, whereas Tinuviel is, shall we say, a bit odd sounding. Thorin Oakenshield, even with “O” as a middle name is downright cruel. Name your dog that if you must, but not your kid. Sheesh.
I went to high school with a girl named Evenstar, and have met a few Loriens.
I wondered that, too. It’s possible he didn’t write it himself - it was one of those sticky-backed nametags that say “Hello, my name is _______.” If he wrote it himself, it might have been because the Tolkienesque connection so often goes over people’s heads that he’s not constantly on guard against it.
He’s not. I mean, he has to play it off like “<sigh>…yes, the ‘O’ does stand for '‘Oakenshield’…it’s ever so bothersome”, but if he didn’t secretly dig it, the “O” wouldn’t be on the name tag.
I think Thorin would be pretty cool as a name (not too far off from some names that are popular in the family), but Oakenshield is taking it a bit too far.
elfbabe is happy she didn’t end up getting named Idril Celebrindal.
Wasn’t she the daughter of Celebrex?
Still continuing the Trek theme, a friend in college had a girlfriend named Tepring.
[Bill Cosby] My father confused me. From the ages of one to seven, I thought my name was Jesus Christ![/BC]
Purposefully misspelled from “T’Pring”? (Also the name of a British pop group, a one-hit wonder for “Heart and Soul”).
Wasn’t it T’Pau that made “Heart and Soul?”