Thread:Ragnarok6354/@comment-22521487-20151221002650/@comment-24187738-20151221004748

The accurate romanization of the Kanji is Tōjō. But because it's hard to find the ō, and it's also not supported in SIF's character set, they change it to simply o instead. However, that's an inaccurate pronunciation of the word. We avoid using Tōjō because it's hard to type the ō too in searching for page names, so we keep to Toujou in accordance with the original Japanese.

This also applies to the Kousaka family name, and quite a few song names.