Stanczyk was Reading Eastman’s Online Newsletter. Today he informed me that there is an app for “that”. Now it is becoming a running joke — so I laughed when I read that Icelanders needed an app to know if they were dating a cousin or not (already available for Android and this jester asked about an app for iPhone/iOS − will update later when a reply is received).
Now this jester has known for some time that if you want to research closed genealogical populations, particularly for DNA, you study the American Amish and you study Iceland. According to the CIA Factbook (for Iceland), there will be a projected population of slightly over 317,000 this July. A common settlement date of 874 C.E. is accepted to be earliest time, but there is new evidence that Iceland may have been settled even a bit earlier than that. Almost everyone dates from the original settlers (Iceland has a very low immigration population).
In a previous article about this, back in 2007 (which I see was updated January 2014). The website islendingabok.is (online database), which hosts the online registry Íslendingabók (“The Book of Icelanders”). Íslendingabók is the product of a cooperation between Icelandic company deCODE Genetics and Fridrik Skúlason.
Genealogists in Iceland say all Icelanders are descendants of the bishop Jón Arason and according to islendingabok.is. Arason and his partner, Helga Sigurdardóttir, had at least nine children who were all quite fertile, while many of the other members of the then 65,000 population weren’t. So experts argue all Icelanders alive today probably derive from the good bishop. On the website of the University in Iceland this argument is supported by their mathematical formula.