Unless both parents are foreign, parents in Iceland must submit their child's name to the National Registry within six months of birth. If the name is not on the registry's list of approved names, parents must seek approval of the name with the Icelandic Naming Committee.
About half of the names submitted get rejected for violating Iceland's strict naming requirements. Among these requirements, names must be capable of having Icelandic grammatical endings, may not conflict with the linguistic structure of Iceland, and should be written in accordance with the ordinary rules of Icelandic orthography.
So, for example, if a name contains a letter that does not appear in the Icelandic alphabet (the letters C, Q, and W, for example), the names are banned.