I hate this "anglo-saxon" meme. The head of Google+ has an Indian name. His boss has a Russian name. And Google+ seems to be going strong in Asia, with names like สมนึกน้อย or 盧小小.
Could you please write "unconventional" instead?
There are good and coherent arguments for allowing anonymity and strong pseudonyms, but the accusations of racism and sexism are definitely not among them.
You're quite right that "Anglo-Saxon" doesn't quite cover it, there are definitely users with Anglo-Saxon names (ones made from words in the dictionary, usually) who've fallen afoul of the naming policy. In my far-from-comprehensive experience, people who've put their names in non-Latin scripts have a higher suspend rate. It's not really amenable to statistical evidence, I agree, but that's the crux of my racism claim. If you don't agree with my anecdotal observation, that's fine, but it's made in good faith.
I am far unhappier writing "unconventional" (though users with unconventional names have been banned) because it reinforces the idea that the "convention" is Latin script. This is not the case for a huge portion of the world.
As for the accusations of sexism (and also homophobia, transphobia etc. that I didn't mention), the page I linked went into some detail about why members of some disadvantaged groups would be further disadvantaged by the name policy. Were there concrete rebuttals you wanted to make to them? I use "sexist" in the structural sense of disadvantaging (maybe indirectly) women on average more than men rather than imagining Gundotra and Horowitz waking up each morning thinking "how can we keep the wimminz down today?"
Could you please write "unconventional" instead?
There are good and coherent arguments for allowing anonymity and strong pseudonyms, but the accusations of racism and sexism are definitely not among them.