BOFFINS spent hours searching for Wales's most common name - before deciding it was Jones.
The unsurprising conclusion by University College London reveals there were 400,000 families called Jones in Great Britain, with many in North Wales.
Most were upland farmers and lived near Blaenau Ffestiniog. In 1998 there were 431,558 on the electoral roll, up from 336,447 in 1881.
Abroad, Tasmania and New Zealand topped the Jones league.
The survey found Smith was still the most common surname in Britain.
Researchers came from University College London and the universities of Leicester and Nottingham.
They studied the distribution of surnames to understand patterns of population movement and cultural identity.
* Find out more at www.spatial-literacy.org