The name "Tit Sei Kau" and "Dit Sei Kau" were coined by me at 2009 (see the Flickr description: both were used - Maybe I was too sleepy at that time). At that time I couldn't find the official English name or common English name from the web so I coined the name myself.

Then at 2019, Swire001 set the English name as tip sei kow (version #2). Initially I removed the English name (version #3) because I thought it was not correct. But after a second thought I think it is good to have an English name. But because there was no widely used English name as that time, I picked "Dit Sei Kau" (version #4). That's because I forgot I used "Tit" before in Flickr and the Cantonese spelling is "Dit" so I picked the latter.

Regarding the online search results, I couldn't find any reference to "Dit Sei Kau" before 2019. So those pages use the term "Dit Sei Kau" only because such name was used in OSM since 2019.