All working between the early 80's and the present day? That sounds a little unlikely!

http://www.hkmdb.com/db/people/view.mhtml?id=12234&display_set=eng

http://www.hkmdb.com/db/people/view.mhtml?id=7200&display_set=eng

http://www.hkmdb.com/db/people/view.mhtml?id=7334&display_set=eng

http://www.hkmdb.com/db/people/view.mhtml?id=8897&display_set=eng

Yip Wai Keung (1) has also worked as an actor and an action director, apparently...

all very suspicious!

I'd be quite surprised if Yip Wai Chung (2) wasn't Clarence Yip Wai Chung as well...

http://www.hkmdb.com/db/people/view.mhtml?id=5483&display_set=eng

http://www.hkmdb.com/db/people/view.mhtml?id=5467&display_set=eng

and I suspect that there may be some overlap with Yip Wai Cheong in the filmographies:

http://www.hkmdb.com/db/people/view.mhtml?id=14469&display_set=eng

And Yip Wai Ying acted in one film in 1963, did nothing for 37 years and then became a cinematographer & director on low-budget crap?

http://www.hkmdb.com/db/people/view.mhtml?id=13291&display_set=eng

might the 1964 actor have been Yip Wai Ming?

http://www.hkmdb.com/db/people/view.mhtml?id=16335&display_set=eng

Be nice to get confirmation that these two Yip Wai Mans were different people too (both assistant directors).

http://www.hkmdb.com/db/people/view.mhtml?id=16970&display_set=eng
http://www.hkmdb.com/db/people/view.mhtml?id=9472&display_set=eng

And one more... both Clarence Yip Wai Chung and Wilson Yip Wai Shun are listed in the cast of BELOVED SON OF GOD (1988). Possible mix-up?

http://hkmdb.com/db/movies/view.mhtml?id=7089&display_set=eng

According to iPAC, the symbols of Yip Wai Keung 12234 and Yip Wai Keung 8897 are not correct. They should be same of Grand Yip 7200.

If nobody stops me in 15 days, I will merge them.

Yip Wai Keung 7334 is more complicated... according to iPAC its symbols are correct, as action director and editor...