Mills, A.D. A Dictionary of British Place Names (2003) Oxford University Press
Morgan, T.J. & Morgan, Prys. Welsh Surnames (1985) University of Wales Press
Reaney, P.H. & Wilson, R.M. A Dictionary of English Surnames (2005) Oxford University Press
Stephens, Meic. Welsh Names for your Children (2003) St David's Press
Watson, W.J. The Celtic Place-Names of Scotland (2004) Birlinn Ltd
Withycombe, E.G. The Oxford Dictionary of English Christian Names (1977) Oxford University Press
Online:
Folklore: Journal of Folklore - accessed online at JSTOR
Behind The Name
Medieval Names Archive
University College London, Celtic Inscribed Stones Project (CISP)
Usage and Popularity:
Ancestry.co.uk
For England, Wales, Scotland and Isle of Man Census 1841-1901 and Birth, Marriage and Death Index 1837-1984 and 1984-2004.
Family Search
For International Genealogical Index.