I just read in an International Screen article that Kong Hung (or Chiang Hung) is the actress Tong Dan, who worked in Shaw's Cantonese division. She adopted the new name when she started working at Cathay.

Kong Hung
http://hkmdb.com/db/people/view.mhtml?id=3441&display_set=eng

Tong Dan
http://hkmdb.com/db/people/view.mhtml?id=1024&display_set=eng

A look at the HKFA catalog confirmed this.

http://ipac.hkfa.lcsd.gov.hk/ipac20/ipac.jsp?session=1D2715818RS76.111&menu=search&aspect=basic_search&npp=10&ipp=20&profile=hkfa&ri=&index=NAMEBRP&term=tong+dan&x=0&y=0&aspect=basic_search

Thanks, Dave. Will merge shortly.

Tong Dan - > Kong Hung (1)

The Tolling Bell (1940)
Besieged (1959)
The Impossible Son-in-Law (1959)
Pubescence (1961)
Dream of the Red Chamber (1962) ... Xue Yan
Mid-Nightmare (Part 2) (1963)
The Love Eterne (1963)

Thanks Dennis! I'll write up a short bio for the DB that also elucidates the name change.

Hey, that'd be great.