Commonly Welsh surnames where a free DNA test appears to be currently on offer include:
Gough
Hendricks
Parry
Perry
Phillips/Philips
Picton
Roach, Roache, Roch, Roche
http://isogg.org/wiki/Free_DNA_testsAnd:
Pierce
For any interested new British Isles participant, this project is currently offering to pay for a 37 marker test.
http://piercednanorth.com/I'm not connected to any of these offers, and you'll have to check the page and get in contact with the relevant surname project administrators if you'd like to take advantage of the offers. The details vary. Typically the idea is to help expand the number of men with known/documented UK ancestry in the project. For example:
"Contact the administrator of the Phillips DNA Project for further information. The PHILLIPS DNA Project will fully sponsor any male PHILLIPS or any variation of the surname PHILLIPS if he lives in the UK or Ireland and is willing to supply a five generation PHILLIPS family tree."
