I understand that your parent may be misusing the word romanization, though the intent of his comment is clear. The name of the capital of Japan (東京) is spelled

I understand that your parent may be misusing the word romanization, though the intent of his comment is clear. The name of the capital of Japan (東京) is spelled differently in different languages, Tokyo and Tokio being two of them. If you're going to be strict with respect to romanization and use accents, isn't the circumflex used to indicate long vowels, at least in Kunrei? So, Tôkyô? Or in Hepburn, the macron? Tōkyō? I've never come across acute being used for this.