I decided to try one of the DNA test services now available. Basically they give you a way to compare either direct male lines (the "Y" chromosome), or female lines (mitochondrial DNA)
So, if you are the Deegan son of a Deegan son, of a Deegan son, etc. we could see if potentially we have similar "Y" chromosomes, and therefore a common male ancestor.
Basically MEN with the D*g*n name are candidates. There are already 2 Degnans tested on this site.
I've already sent my sample (a cheek scraping, NOT blood) to this service, and if you choose to do it, they would tell us if we had a match. They can only make statistical estimates. A perfect match in their test would suggest a 50% percent probabilty that we had a common male ancestor withing the past seven generation (less than 200 years).