There are many different branches of Wing Chun practiced in Mainland China.
Basically, they all go back to the same few "mythological" ancestors.
The Fatsaan Wing Chun Association has established three main "strains":
1. Leung Jan
2. Fung Siu Ching
3. Law Man Gung
A short, non exhaustive list of styles practiced in Fatsaan today:
Gwok Si Wing Chun
Lun Gai Wing Chun
Pan Nam Wing Chun
Lai Hip Zi Wing Chun
Yuen Kei Saan Wing Chun
(Leung Ngau - Leung Jan Sing - lineage)
Sum Nung Chun
Yiu Si Wing Chun
Lam Soi Man Wing Chun
Lam Soi Boh Wing Chun
Zheng Do Wing Chun
Sei Mun Wing Chun
Jeung Bo Wing Chun
etc.
In Gwongjaau there is:
Sum Nung Wing
Wong Jing Wing Chun
Saam Gaau Wing Chun
Gulo Wing Chun
Yuen Chai Wan Wing Chun
Ban Chung Cho Ga Wing Chun
Paau Fa Lien Wing Chun
etc.
In Seundak there is also Chan Yu Min Siu Lam Wing Chun (they use the "eternal" character, though).
This so called "Weng Chun" has created quite a mess or caused a lot of confusion.
Because there was very little information available about it, people in the West started making up stories and connecting some dots in ways which have no basis in reality.
Andreas Hofmann's "Went Chun" is entirely his own creation based on a few short visits in HK and China and what he picked up from other sources.
His stuff is not the historical Weng Chun and as such looking to it for an idea of the old ways or the style's origins is wrong.
"Weng Chun" does not move or use the body as Mr. Hoffman does.
But at the time he came into the limelight nobody knew any better because there was nothing compare with.
Now, what is "Weng Chun" really?
First of all, we need to understand that it is technically not a style as such.
The various teachers of "Weng Chun" all had a mixed curriculum with material from different sources and different styles, yet they called everything "Weng Chun"...
Take Zhu Chung Man as an example: he learned CLF first, then later some material from the Dong brothers, who had gotten this from Fong Siu Ching. Later again he picked up a pole form from another source, etc. How can Fa Kuen, Ping Kuen, Siu Mui Fa Baat Gwa (?) be "Weng Chun"?
Something similar applies to Tang Yik's Weng Chun. It should be noted that his father's students in Mainland China don't call what they learnt from Tang Suen "Weng Chun". Instead they call only the material which came from Fung Siu Ching "Wing Chun", the rest is Hung Kuen and Siulam Gung Fu, basically. They also play it exactly how other old styles of Wing and the various types of Hei Ban (opera) Wing Chun do. Same type of moves, same stances, etc. Tang Yik played his art differently.
There is much strife in the "Weng Chun" community because of this and because there are different versions of certain stories left by the ancestors and everybody believes that the particular version they believe in, is the correct one.
Just like in "Wing Chun".
So, was there some old style called "Weng Chun"?
Or is it just a name some people chose to use as an umbrella term for their particular mix of Gung Fu knowledge?
Just like Chan Yu Min did.
Many people think that him using the "eternal" character is evidence that that was the original name - especially so because his descendants will adamantly claim that this is so.
However, there are still people alive today - inside and outside of his lineage - that it was a name he chose for his school to distinguish himself from others. Before that no one used that character.
Fung Siu Ching is also a rather obscure character. The common story told about him through the Yuen Kei Saan/Sum Nung lineage has some serious problems and stands in quite stark contrast with what the "Weng Chun" people say about him.
But that is another discussion.