"Lost Ancestors" is the name of a group on the Multiply.com website.
It has an extensive set of information of genealogical interest, such as "Names and That: 3,258 surnames up to now. Last update: 20 January 2010."
It has spawned some related (sub)groups:
Registering for Multiply is free and allows more access to groups than one can get when not logged in.
This page is a "stub" and could be improved by additions and other edits.