The name is derived from the Irish Gaelic personal name "ó hEamhthaigh."  The origins of this ancient personal name are obscure. It is possible that there is a connection to the word "eamh" which denotes a "groaning or exclamation of disgust."
The surname Hefley was first found in the Athlone region, County Westmeath (Irish: An Iarmhí) in the Irish Midlands, province of Leinster. Later some records of the family were found in Waterford and Cork. 
Early recorded instances of the name are rare, but there was a bearer recorded as a husbandman of Thisteinagh, in Couty Westmeath in 1601.
This web page shows only a small excerpt of our Hefley research. More information is included under the topic Early Hefley History in all our PDF Extended History products and printed products wherever possible.
Joel M. Hefley (b. 1935), American Republican politician, Member of Colorado State House of Representatives, 1977-78; Member of Colorado State Senate, 1979-86; U.S. Representative from Colorado 5th District, 1987-2007 
Herald Hefley, American Democrat politician, Candidate for Iowa State House of Representatives from Dallas County, 1950 
H. R. Hefley, American Democrat politician, Candidate for Iowa State Senate 17th District, 1948 
^ Filby, P. William, Meyer, Mary K., Passenger and immigration lists index : a guide to published arrival records of about 500,000 passengers who came to the United States and Canada in the seventeenth, eighteenth, and nineteenth centuries. 1982-1985 Cumulated Supplements in Four Volumes Detroit, Mich. : Gale Research Co., 1985, Print (ISBN 0-8103-1795-8)