Strangely I have put my nickname as first name and . for last name and haven't had any trouble. Do google perhaps validate names using an english-specific validator that doesn't run when your location isn't an english-speaking country?
You may object to the tone and language, but I think he has a legitimate complaint. It's his real name he's attempting to use, and Google is saying that doesn't pass their standards. How arrogant. If someone told me I have to use a name other than my real one I'd probably tell them to fuck off.
As Google aspires to be a global social network, the polite thing to do is at least allow people to use their real names. His name is not so strange, it's just a one-word name. It doesn't even use "strange" characters, if you want to be seven bittish about it.
"Stilgherrian"
$ man ascii
Yup, they're all there.
It's mind-bogglingly thick of Google to be a stick in the mud about this, never mind the related pseudonym issue.