There's also an original Jack Vance Bibliography available on the internet. It is compiled by Hans Verkuil and requests for this biblio, as well as requests for Gregg Parmentier's Vance Phile (please state whether you want a copy of it in Postscript or ASCII), should go to:
parmentier@iowasp.physics.uiowa.edu
Mark Carpentier Alting introduced so called house names at Meulenhoff.
This means that it could be that two different person could have translated books under the same house names. So it is almost impossible to know for sure who translated what!
The only information I can add to this is that the following names are the real names of the translators (thanks go to Annemarie van Ewijck for this):
House names are: