I don't know if a Surname Dictionary exists for all the possible surnames..... However I have two you might be interested in A Dictionary of English Surnames, the Standard Guide to English Surnames by P. H. Reaney & R. M. Wilson Oxford University Press £9.99 the paperback version ISBN 0-19-863146-4 I got mine at Barnes & Nobles I forgot what I paid for it. The above price is English pounds. This is a good resource. The next one is alright, just not organized like a Dictionary, exactly. Book of Irish Names, First, Family & Place Names by Ronan Coghlan, Ida Grehan & P.W. Joyce ISBN 0-8069-6944-X $9.95 American. Both are interesting. I found the first one more helpful. Good Luck. Linda DougMIV@aol.com