Afaik, `name` is the current commonly used name. Being commonly used has nothing to do with using standard romanisation. As long as "Dit Sei Kau" is the popular English name, even if it is caused by an error or a typo, it should still be used.

Languages (including vocabularies and proper nouns) can (and do) change, and in this case your edit in 2019 was influential enough to modify the actual name. If you wanted to revert it to "Tit", you should have done so before "Dit" became the popular name. But now it's too late, and the change should be respected.