Moved from WikiNames:
If you are interested in international WikiNames, these are the relevant character sets for Latin-1:
upperletters = "A-ZÀÁÂÃÄÅÆÈÉÊËÌÍÎÏÒÓÔÕÖØÙÚÛÜÝÇÐÑÞ"which includes (among other letters) Ð Ð Ý Ý Þ Þ Ç Ç
lowerletters = "a-zàáâãäåæèéê?ëìíîïòóôõöøùúûüýÿçµß?ðñþ"which includes (among other letters) ð ð ç ç ë ë þ þ µ µ
So ... there's no such thing as captial Y diaeresis, only lowercase y diaeresis ?
One should also note that WardsWiki, hosted in America, has standardized on American English spellings for WikiNames.